64665425 has 18 divisors (see below), whose sum is σ = 88141494. Its totient is φ = 47027200.

The previous prime is 64665413. The next prime is 64665437. The reversal of 64665425 is 52456646.

It is an interprime number because it is at equal distance from previous prime (64665413) and next prime (64665437).

It can be written as a sum of positive squares in 3 ways, for example, as 7744 + 64657681 = 88^2 + 8041^2 .

It is not a de Polignac number, because 64665425 - 2⁴ = 64665409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7664 + ... + 13713.

Almost surely, 2^64665425 is an apocalyptic number.

It is an amenable number.

64665425 is a deficient number, since it is larger than the sum of its proper divisors (23476069).

64665425 is a wasteful number, since it uses less digits than its factorization.

64665425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21409 (or 21393 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The square root of 64665425 is about 8041.4815177304. The cubic root of 64665425 is about 401.3815250613.

The spelling of 64665425 in words is "sixty-four million, six hundred sixty-five thousand, four hundred twenty-five".