51656465 has 8 divisors (see below), whose sum is σ = 70843200. Its totient is φ = 35421552.

The previous prime is 51656417. The next prime is 51656471. The reversal of 51656465 is 56465615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51656465 - 2²⁴ = 34879249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737915 + ... + 737984.

It is an arithmetic number, because the mean of its divisors is an integer number (8855400).

Almost surely, 2^51656465 is an apocalyptic number.

It is an amenable number.

51656465 is a deficient number, since it is larger than the sum of its proper divisors (19186735).

51656465 is a wasteful number, since it uses less digits than its factorization.

51656465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475911.

The product of its digits is 108000, while the sum is 38.

The square root of 51656465 is about 7187.2432128042. The cubic root of 51656465 is about 372.4273449577.

The spelling of 51656465 in words is "fifty-one million, six hundred fifty-six thousand, four hundred sixty-five".