64660257 has 6 divisors (see below), whose sum is σ = 93398162. Its totient is φ = 43106832.

The previous prime is 64660243. The next prime is 64660273. The reversal of 64660257 is 75206646.

64660257 is a `hidden beast` number, since 6 + 46 + 602 + 5 + 7 = 666.

64660257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 2313441 = 7896^2 + 1521^2 .

It is not a de Polignac number, because 64660257 - 2²² = 60465953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64660457) 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 in 5 ways as a sum of consecutive naturals, for example, 3592228 + ... + 3592245.

Almost surely, 2^64660257 is an apocalyptic number.

It is an amenable number.

64660257 is a deficient number, since it is larger than the sum of its proper divisors (28737905).

64660257 is a wasteful number, since it uses less digits than its factorization.

64660257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184479 (or 7184476 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 64660257 is about 8041.1601774868. The cubic root of 64660257 is about 401.3708320983.

The spelling of 64660257 in words is "sixty-four million, six hundred sixty thousand, two hundred fifty-seven".