156821139072 has 512 divisors, whose sum is σ = 515039616000. Its totient is φ = 46673915904.

The previous prime is 156821139061. The next prime is 156821139091. The reversal of 156821139072 is 270931128651.

156821139072 is a `hidden beast` number, since 1 + 568 + 2 + 1 + 13 + 9 + 0 + 72 = 666.

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, 177599943 + ... + 177600825.

It is an arithmetic number, because the mean of its divisors is an integer number (1005936750).

Almost surely, 2^156821139072 is an apocalyptic number.

156821139072 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 156821139072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257519808000).

156821139072 is an abundant number, since it is smaller than the sum of its proper divisors (358218476928).

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

156821139072 is a wasteful number, since it uses less digits than its factorization.

156821139072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 156821139072 in words is "one hundred fifty-six billion, eight hundred twenty-one million, one hundred thirty-nine thousand, seventy-two".