156661556164 has 6 divisors (see below), whose sum is σ = 274157723294. Its totient is φ = 78330778080.

The previous prime is 156661556137. The next prime is 156661556221. The reversal of 156661556164 is 461655166651.

It can be written as a sum of positive squares in only one way, i.e., 156189363264 + 472192900 = 395208^2 + 21730^2 .

It is a super-2 number, since 2×156661556164² (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 as a sum of consecutive naturals, namely, 19582694517 + ... + 19582694524.

Almost surely, 2^156661556164 is an apocalyptic number.

It is an amenable number.

156661556164 is a deficient number, since it is larger than the sum of its proper divisors (117496167130).

156661556164 is a wasteful number, since it uses less digits than its factorization.

156661556164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39165389045 (or 39165389043 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 52.

The spelling of 156661556164 in words is "one hundred fifty-six billion, six hundred sixty-one million, five hundred fifty-six thousand, one hundred sixty-four".