2155617656 has 16 divisors (see below), whose sum is σ = 4042558800. Its totient is φ = 1077601984.

The previous prime is 2155617637. The next prime is 2155617671. The reversal of 2155617656 is 6567165512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24116 + ... + 69948.

It is an arithmetic number, because the mean of its divisors is an integer number (252659925).

Almost surely, 2^2155617656 is an apocalyptic number.

It is an amenable number.

2155617656 is a deficient number, since it is larger than the sum of its proper divisors (1886941144).

2155617656 is a wasteful number, since it uses less digits than its factorization.

2155617656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51718 (or 51714 counting only the distinct ones).

The product of its digits is 378000, while the sum is 44.

The square root of 2155617656 is about 46428.6297019415. The cubic root of 2155617656 is about 1291.7860115843.

The spelling of 2155617656 in words is "two billion, one hundred fifty-five million, six hundred seventeen thousand, six hundred fifty-six".