2656165641 has 4 divisors (see below), whose sum is σ = 3541554192. Its totient is φ = 1770777092.

The previous prime is 2656165609. The next prime is 2656165669. The reversal of 2656165641 is 1465616562.

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 2656165641 - 2⁵ = 2656165609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2656165593 and 2656165602.

It is not an unprimeable number, because it can be changed into a prime (2656165601) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 442694271 + ... + 442694276.

It is an arithmetic number, because the mean of its divisors is an integer number (885388548).

Almost surely, 2^2656165641 is an apocalyptic number.

It is an amenable number.

2656165641 is a deficient number, since it is larger than the sum of its proper divisors (885388551).

2656165641 is an equidigital number, since it uses as much as digits as its factorization.

2656165641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885388550.

The product of its digits is 259200, while the sum is 42.

The square root of 2656165641 is about 51538.0019112111. The cubic root of 2656165641 is about 1384.8999030128.

The spelling of 2656165641 in words is "two billion, six hundred fifty-six million, one hundred sixty-five thousand, six hundred forty-one".