156857822568 has 160 divisors (see below), whose sum is σ = 465150232800. Its totient is φ = 49247056512.

The previous prime is 156857822519. The next prime is 156857822573. The reversal of 156857822568 is 865228758651.

It is a happy number.

156857822568 is a `hidden beast` number, since 1 + 5 + 6 + 8 + 578 + 2 + 2 + 56 + 8 = 666.

It is a super-2 number, since 2×156857822568² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2093155 + ... + 2166797.

It is an arithmetic number, because the mean of its divisors is an integer number (2907188955).

Almost surely, 2^156857822568 is an apocalyptic number.

156857822568 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 156857822568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232575116400).

156857822568 is an abundant number, since it is smaller than the sum of its proper divisors (308292410232).

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

156857822568 is a wasteful number, since it uses less digits than its factorization.

156857822568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73853 (or 73840 counting only the distinct ones).

The product of its digits is 64512000, while the sum is 63.

The spelling of 156857822568 in words is "one hundred fifty-six billion, eight hundred fifty-seven million, eight hundred twenty-two thousand, five hundred sixty-eight".