64660957 has 2 divisors, whose sum is σ = 64660958. Its totient is φ = 64660956.

The previous prime is 64660927. The next prime is 64660961. The reversal of 64660957 is 75906646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42889401 + 21771556 = 6549^2 + 4666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64660957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64660927) 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, 32330478 + 32330479.

It is an arithmetic number, because the mean of its divisors is an integer number (32330479).

Almost surely, 2^64660957 is an apocalyptic number.

It is an amenable number.

64660957 is a deficient number, since it is larger than the sum of its proper divisors (1).

64660957 is an equidigital number, since it uses as much as digits as its factorization.

64660957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 64660957 is about 8041.2037034265. The cubic root of 64660957 is about 401.3722804819.

The spelling of 64660957 in words is "sixty-four million, six hundred sixty thousand, nine hundred fifty-seven".