165556656132013 has 4 divisors (see below), whose sum is σ = 165556689249600. Its totient is φ = 165556623014428.

The previous prime is 165556656131989. The next prime is 165556656132041. The reversal of 165556656132013 is 310231656655561.

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 165556656132013 - 2⁹ = 165556656131501 is a prime.

It is a super-2 number, since 2×165556656132013² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165556656139013) 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, 7354963 + ... + 19626736.

It is an arithmetic number, because the mean of its divisors is an integer number (41389172312400).

Almost surely, 2^{165556656132013} is an apocalyptic number.

It is an amenable number.

165556656132013 is a deficient number, since it is larger than the sum of its proper divisors (33117587).

165556656132013 is an equidigital number, since it uses as much as digits as its factorization.

165556656132013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33117586.

The product of its (nonzero) digits is 14580000, while the sum is 55.

The spelling of 165556656132013 in words is "one hundred sixty-five trillion, five hundred fifty-six billion, six hundred fifty-six million, one hundred thirty-two thousand, thirteen".