664416425 has 12 divisors (see below), whose sum is σ = 825014160. Its totient is φ = 530799120.

The previous prime is 664416409. The next prime is 664416443. The reversal of 664416425 is 524614466.

It is not a de Polignac number, because 664416425 - 2⁴ = 664416409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 494 + ... + 36456.

It is an arithmetic number, because the mean of its divisors is an integer number (68751180).

Almost surely, 2^664416425 is an apocalyptic number.

It is an amenable number.

664416425 is a deficient number, since it is larger than the sum of its proper divisors (160597735).

664416425 is a wasteful number, since it uses less digits than its factorization.

664416425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36712 (or 36707 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 664416425 is about 25776.2763990457. The cubic root of 664416425 is about 872.5964732146.

The spelling of 664416425 in words is "six hundred sixty-four million, four hundred sixteen thousand, four hundred twenty-five".