56663691 has 16 divisors (see below), whose sum is σ = 89131008. Its totient is φ = 31334400.

The previous prime is 56663689. The next prime is 56663707. The reversal of 56663691 is 19636665.

56663691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56663691 - 2¹ = 56663689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56663591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42870 + ... + 44171.

It is an arithmetic number, because the mean of its divisors is an integer number (5570688).

Almost surely, 2^56663691 is an apocalyptic number.

56663691 is a deficient number, since it is larger than the sum of its proper divisors (32467317).

56663691 is a wasteful number, since it uses less digits than its factorization.

56663691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87082.

The product of its digits is 174960, while the sum is 42.

The square root of 56663691 is about 7527.5288773940. The cubic root of 56663691 is about 384.0917274902.

The spelling of 56663691 in words is "fifty-six million, six hundred sixty-three thousand, six hundred ninety-one".