156964289474521 has 9 divisors (see below), whose sum is σ = 157343299115583. Its totient is φ = 156586190696040.

The previous prime is 156964289474519. The next prime is 156964289474549. The reversal of 156964289474521 is 125474982469651.

The square root of 156964289474521 is 12528539.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 744787986121 + 156219501488400 = 863011^2 + 12498780^2 .

It is not a de Polignac number, because 156964289474521 - 2¹ = 156964289474519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156964289474561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5274500040 + ... + 5274529798.

Almost surely, 2^{156964289474521} is an apocalyptic number.

156964289474521 is the 12528539-th square number.

156964289474521 is the 6264270-th centered octagonal number.

It is an amenable number.

156964289474521 is a deficient number, since it is larger than the sum of its proper divisors (379009641062).

156964289474521 is an frugal number, since it uses more digits than its factorization.

156964289474521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60360 (or 30180 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 73.

The spelling of 156964289474521 in words is "one hundred fifty-six trillion, nine hundred sixty-four billion, two hundred eighty-nine million, four hundred seventy-four thousand, five hundred twenty-one".