2156876657 has 4 divisors (see below), whose sum is σ = 2322790260. Its totient is φ = 1990963056.

The previous prime is 2156876651. The next prime is 2156876707. The reversal of 2156876657 is 7566786512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 301334881 + 1855541776 = 17359^2 + 43076^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156876657 - 2⁸ = 2156876401 is a prime.

It is a super-2 number, since 2×2156876657² = 9304233827022991298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2156876599 and 2156876608.

It is not an unprimeable number, because it can be changed into a prime (2156876651) 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, 82956782 + ... + 82956807.

It is an arithmetic number, because the mean of its divisors is an integer number (580697565).

Almost surely, 2^2156876657 is an apocalyptic number.

It is an amenable number.

2156876657 is a deficient number, since it is larger than the sum of its proper divisors (165913603).

2156876657 is a wasteful number, since it uses less digits than its factorization.

2156876657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165913602.

The product of its digits is 4233600, while the sum is 53.

The square root of 2156876657 is about 46442.1861780860. The cubic root of 2156876657 is about 1292.0374543437.

The spelling of 2156876657 in words is "two billion, one hundred fifty-six million, eight hundred seventy-six thousand, six hundred fifty-seven".