157220661556 has 12 divisors (see below), whose sum is σ = 314441323168. Its totient is φ = 67380283512.

The previous prime is 157220661541. The next prime is 157220661557. The reversal of 157220661556 is 655166022751.

157220661556 is an admirable number.

It is a super-2 number, since 2×157220661556² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157220661557) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2807511786 + ... + 2807511841.

Almost surely, 2^157220661556 is an apocalyptic number.

It is an amenable number.

157220661556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

157220661556 is a wasteful number, since it uses less digits than its factorization.

157220661556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615023638 (or 5615023636 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 157220661556 in words is "one hundred fifty-seven billion, two hundred twenty million, six hundred sixty-one thousand, five hundred fifty-six".