64975961 has 2 divisors, whose sum is σ = 64975962. Its totient is φ = 64975960.

The previous prime is 64975931. The next prime is 64975987. The reversal of 64975961 is 16957946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 414736 = 8035^2 + 644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64975961 is a prime.

It is not a weakly prime, because it can be changed into another prime (64975901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32487980 + 32487981.

It is an arithmetic number, because the mean of its divisors is an integer number (32487981).

Almost surely, 2^64975961 is an apocalyptic number.

It is an amenable number.

64975961 is a deficient number, since it is larger than the sum of its proper divisors (1).

64975961 is an equidigital number, since it uses as much as digits as its factorization.

64975961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The square root of 64975961 is about 8060.7667749415. The cubic root of 64975961 is about 402.0230034773.

The spelling of 64975961 in words is "sixty-four million, nine hundred seventy-five thousand, nine hundred sixty-one".