2156566576231 has 4 divisors (see below), whose sum is σ = 2156591758072. Its totient is φ = 2156541394392.

The previous prime is 2156566576211. The next prime is 2156566576243. The reversal of 2156566576231 is 1326756656512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156566576231 is a prime.

It is a super-2 number, since 2×2156566576231² (a number of 25 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 (2156566576201) 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, 12462021 + ... + 12633886.

It is an arithmetic number, because the mean of its divisors is an integer number (539147939518).

Almost surely, 2^{2156566576231} is an apocalyptic number.

2156566576231 is a deficient number, since it is larger than the sum of its proper divisors (25181841).

2156566576231 is an equidigital number, since it uses as much as digits as its factorization.

2156566576231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25181840.

The product of its digits is 13608000, while the sum is 55.

The spelling of 2156566576231 in words is "two trillion, one hundred fifty-six billion, five hundred sixty-six million, five hundred seventy-six thousand, two hundred thirty-one".