64569997 has 2 divisors, whose sum is σ = 64569998. Its totient is φ = 64569996.

The previous prime is 64569983. The next prime is 64570019. The reversal of 64569997 is 79996546.

64569997 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., 51566761 + 13003236 = 7181^2 + 3606^2 .

It is a cyclic number.

It is not a de Polignac number, because 64569997 - 2¹⁵ = 64537229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64569917) 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, 32284998 + 32284999.

It is an arithmetic number, because the mean of its divisors is an integer number (32284999).

Almost surely, 2^64569997 is an apocalyptic number.

It is an amenable number.

64569997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64569997 is an equidigital number, since it uses as much as digits as its factorization.

64569997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3674160, while the sum is 55.

The square root of 64569997 is about 8035.5458433139. The cubic root of 64569997 is about 401.1839857367.

The spelling of 64569997 in words is "sixty-four million, five hundred sixty-nine thousand, nine hundred ninety-seven".