156397989888 has 1040 divisors, whose sum is σ = 587340569600. Its totient is φ = 40967700480.

The previous prime is 156397989877. The next prime is 156397989947. The reversal of 156397989888 is 888989793651.

156397989888 is a `hidden beast` number, since 1 + 56 + 397 + 98 + 98 + 8 + 8 = 666.

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 79 ways as a sum of consecutive naturals, for example, 5045096433 + ... + 5045096463.

Almost surely, 2^156397989888 is an apocalyptic number.

156397989888 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 156397989888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293670284800).

156397989888 is an abundant number, since it is smaller than the sum of its proper divisors (430942579712).

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

156397989888 is an frugal number, since it uses more digits than its factorization.

156397989888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 62 counting only the distinct ones).

The product of its digits is 1881169920, while the sum is 81.

The spelling of 156397989888 in words is "one hundred fifty-six billion, three hundred ninety-seven million, nine hundred eighty-nine thousand, eight hundred eighty-eight".