2156864413 has 16 divisors (see below), whose sum is σ = 2394311040. Its totient is φ = 1926388800.

The previous prime is 2156864387. The next prime is 2156864417. The reversal of 2156864413 is 3144686512.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156864413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156864417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883831 + ... + 886267.

It is an arithmetic number, because the mean of its divisors is an integer number (149644440).

Almost surely, 2^2156864413 is an apocalyptic number.

It is an amenable number.

2156864413 is a deficient number, since it is larger than the sum of its proper divisors (237446627).

2156864413 is a wasteful number, since it uses less digits than its factorization.

2156864413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3828.

The product of its digits is 138240, while the sum is 40.

The square root of 2156864413 is about 46442.0543580923. The cubic root of 2156864413 is about 1292.0350094911.

The spelling of 2156864413 in words is "two billion, one hundred fifty-six million, eight hundred sixty-four thousand, four hundred thirteen".