51646465 has 48 divisors (see below), whose sum is σ = 73737216. Its totient is φ = 34473600.

The previous prime is 51646457. The next prime is 51646471. The reversal of 51646465 is 56464615.

It is not a de Polignac number, because 51646465 - 2³ = 51646457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 727380 + ... + 727450.

It is an arithmetic number, because the mean of its divisors is an integer number (1536192).

Almost surely, 2^51646465 is an apocalyptic number.

It is an amenable number.

51646465 is a deficient number, since it is larger than the sum of its proper divisors (22090751).

51646465 is a wasteful number, since it uses less digits than its factorization.

51646465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 139 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 51646465 is about 7186.5475021042. The cubic root of 51646465 is about 372.4033110909.

The spelling of 51646465 in words is "fifty-one million, six hundred forty-six thousand, four hundred sixty-five".