18748993536 has 832 divisors, whose sum is σ = 72217098240. Its totient is φ = 4729798656.

The previous prime is 18748993519. The next prime is 18748993553. The reversal of 18748993536 is 63539984781.

18748993536 is a `hidden beast` number, since 1 + 8 + 7 + 4 + 8 + 9 + 93 + 536 = 666.

It is an interprime number because it is at equal distance from previous prime (18748993519) and next prime (18748993553).

It is a tau number, because it is divible by the number of its divisors (832).

It is a super-2 number, since 2×18748993536² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (39191040) is a multiple of the sum of its prime divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 815173621 + ... + 815173643.

Almost surely, 2^18748993536 is an apocalyptic number.

18748993536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18748993536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36108549120).

18748993536 is an abundant number, since it is smaller than the sum of its proper divisors (53468104704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18748993536 is an frugal number, since it uses more digits than its factorization.

18748993536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 48 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 18748993536 in words is "eighteen billion, seven hundred forty-eight million, nine hundred ninety-three thousand, five hundred thirty-six".