51451956865 has 16 divisors (see below), whose sum is σ = 62391917952. Its totient is φ = 40728697344.

The previous prime is 51451956841. The next prime is 51451956929. The reversal of 51451956865 is 56865915415.

It is a cyclic number.

It is not a de Polignac number, because 51451956865 - 2³¹ = 49304473217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3371382 + ... + 3386608.

It is an arithmetic number, because the mean of its divisors is an integer number (3899494872).

Almost surely, 2^51451956865 is an apocalyptic number.

It is an amenable number.

51451956865 is a deficient number, since it is larger than the sum of its proper divisors (10939961087).

51451956865 is a wasteful number, since it uses less digits than its factorization.

51451956865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22296.

The product of its digits is 6480000, while the sum is 55.

The spelling of 51451956865 in words is "fifty-one billion, four hundred fifty-one million, nine hundred fifty-six thousand, eight hundred sixty-five".