18539961048 has 432 divisors, whose sum is σ = 64741851720. Its totient is φ = 4938941952.

The previous prime is 18539961001. The next prime is 18539961053. The reversal of 18539961048 is 84016993581.

18539961048 is a `hidden beast` number, since 1 + 8 + 539 + 9 + 61 + 0 + 48 = 666.

It is a super-2 number, since 2×18539961048² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 18539960985 and 18539961003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 173270611 + ... + 173270717.

Almost surely, 2^18539961048 is an apocalyptic number.

18539961048 is a gapful number since it is divisible by the number (18) 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 18539961048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32370925860).

18539961048 is an abundant number, since it is smaller than the sum of its proper divisors (46201890672).

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

18539961048 is a wasteful number, since it uses less digits than its factorization.

18539961048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

It can be divided in two parts, 1853996 and 1048, that added together give a square (1855044 = 1362²).

The spelling of 18539961048 in words is "eighteen billion, five hundred thirty-nine million, nine hundred sixty-one thousand, forty-eight".