2156658644 has 12 divisors (see below), whose sum is σ = 4313317344. Its totient is φ = 924282264.

The previous prime is 2156658619. The next prime is 2156658653. The reversal of 2156658644 is 4468566512.

2156658644 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 38511734 + ... + 38511789.

It is an arithmetic number, because the mean of its divisors is an integer number (359443112).

Almost surely, 2^2156658644 is an apocalyptic number.

It is an amenable number.

2156658644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156658644 is a wasteful number, since it uses less digits than its factorization.

2156658644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77023534 (or 77023532 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 47.

The square root of 2156658644 is about 46439.8389747424. The cubic root of 2156658644 is about 1291.9939206454.

The spelling of 2156658644 in words is "two billion, one hundred fifty-six million, six hundred fifty-eight thousand, six hundred forty-four".