56664989 has 2 divisors, whose sum is σ = 56664990. Its totient is φ = 56664988.

The previous prime is 56664983. The next prime is 56664997. The reversal of 56664989 is 98946665.

56664989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 6041764 = 7115^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 56664989 - 2¹⁶ = 56599453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56664989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56664983) 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 as a sum of consecutive naturals, namely, 28332494 + 28332495.

It is an arithmetic number, because the mean of its divisors is an integer number (28332495).

Almost surely, 2^56664989 is an apocalyptic number.

It is an amenable number.

56664989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56664989 is an equidigital number, since it uses as much as digits as its factorization.

56664989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 53.

The square root of 56664989 is about 7527.6150937731. The cubic root of 56664989 is about 384.0946602751.

The spelling of 56664989 in words is "fifty-six million, six hundred sixty-four thousand, nine hundred eighty-nine".