18985137696 has 240 divisors, whose sum is σ = 64034175744. Its totient is φ = 5405377536.

The previous prime is 18985137679. The next prime is 18985137799. The reversal of 18985137696 is 69673158981.

18985137696 is a `hidden beast` number, since 189 + 85 + 1 + 376 + 9 + 6 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5677401 + ... + 5680743.

Almost surely, 2^18985137696 is an apocalyptic number.

18985137696 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 18985137696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32017087872).

18985137696 is an abundant number, since it is smaller than the sum of its proper divisors (45049038048).

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

18985137696 is a wasteful number, since it uses less digits than its factorization.

18985137696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685 (or 3668 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 18985137696 in words is "eighteen billion, nine hundred eighty-five million, one hundred thirty-seven thousand, six hundred ninety-six".