51464570765 has 16 divisors (see below), whose sum is σ = 63465725232. Its totient is φ = 40034202624.

The previous prime is 51464570741. The next prime is 51464570767. The reversal of 51464570765 is 56707546415.

It can be written as a sum of positive squares in 8 ways, for example, as 1619096644 + 49845474121 = 40238^2 + 223261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51464570765 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51464570767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217877 + ... + 387813.

It is an arithmetic number, because the mean of its divisors is an integer number (3966607827).

Almost surely, 2^51464570765 is an apocalyptic number.

It is an amenable number.

51464570765 is a deficient number, since it is larger than the sum of its proper divisors (12001154467).

51464570765 is a wasteful number, since it uses less digits than its factorization.

51464570765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171616.

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 51464570765 in words is "fifty-one billion, four hundred sixty-four million, five hundred seventy thousand, seven hundred sixty-five".