156557790553 has 4 divisors (see below), whose sum is σ = 156570632208. Its totient is φ = 156544948900.

The previous prime is 156557790551. The next prime is 156557790607. The reversal of 156557790553 is 355097755651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 156557790553 - 2¹ = 156557790551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156557790551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402523 + ... + 6426928.

It is an arithmetic number, because the mean of its divisors is an integer number (39142658052).

Almost surely, 2^156557790553 is an apocalyptic number.

It is an amenable number.

156557790553 is a deficient number, since it is larger than the sum of its proper divisors (12841655).

156557790553 is a wasteful number, since it uses less digits than its factorization.

156557790553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12841654.

The product of its (nonzero) digits is 24806250, while the sum is 58.

The spelling of 156557790553 in words is "one hundred fifty-six billion, five hundred fifty-seven million, seven hundred ninety thousand, five hundred fifty-three".