18998497152 has 384 divisors, whose sum is σ = 60187458240. Its totient is φ = 5727780864.

The previous prime is 18998497129. The next prime is 18998497159. The reversal of 18998497152 is 25179489981.

18998497152 is a `hidden beast` number, since 1 + 8 + 9 + 98 + 497 + 1 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×18998497152² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18998497152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998497159) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113763373 + ... + 113763539.

Almost surely, 2^18998497152 is an apocalyptic number.

18998497152 is a gapful number since it is divisible by the number (12) 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 18998497152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30093729120).

18998497152 is an abundant number, since it is smaller than the sum of its proper divisors (41188961088).

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

18998497152 is a wasteful number, since it uses less digits than its factorization.

18998497152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 383 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 18998497152 in words is "eighteen billion, nine hundred ninety-eight million, four hundred ninety-seven thousand, one hundred fifty-two".