64660457 has 2 divisors, whose sum is σ = 64660458. Its totient is φ = 64660456.

The previous prime is 64660447. The next prime is 64660489. The reversal of 64660457 is 75406646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34234201 + 30426256 = 5851^2 + 5516^2 .

It is a cyclic number.

It is not a de Polignac number, because 64660457 - 2⁴ = 64660441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64660457.

It is not a weakly prime, because it can be changed into another prime (64660417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32330228 + 32330229.

It is an arithmetic number, because the mean of its divisors is an integer number (32330229).

Almost surely, 2^64660457 is an apocalyptic number.

It is an amenable number.

64660457 is a deficient number, since it is larger than the sum of its proper divisors (1).

64660457 is an equidigital number, since it uses as much as digits as its factorization.

64660457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 64660457 is about 8041.1726134936. The cubic root of 64660457 is about 401.3712459233.

The spelling of 64660457 in words is "sixty-four million, six hundred sixty thousand, four hundred fifty-seven".