64563997 has 2 divisors, whose sum is σ = 64563998. Its totient is φ = 64563996.

The previous prime is 64563973. The next prime is 64564009. The reversal of 64563997 is 79936546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56235001 + 8328996 = 7499^2 + 2886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64563997 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 64563997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64563937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32281998 + 32281999.

It is an arithmetic number, because the mean of its divisors is an integer number (32281999).

Almost surely, 2^64563997 is an apocalyptic number.

It is an amenable number.

64563997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64563997 is an equidigital number, since it uses as much as digits as its factorization.

64563997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 64563997 is about 8035.1724934814. The cubic root of 64563997 is about 401.1715590236.

The spelling of 64563997 in words is "sixty-four million, five hundred sixty-three thousand, nine hundred ninety-seven".