51251102765 has 16 divisors (see below), whose sum is σ = 63209970432. Its totient is φ = 39872898624.

The previous prime is 51251102753. The next prime is 51251102789. The reversal of 51251102765 is 56720115215.

It is a cyclic number.

It is not a de Polignac number, because 51251102765 - 2¹² = 51251098669 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 15 ways as a sum of consecutive naturals, for example, 657659 + ... + 731448.

It is an arithmetic number, because the mean of its divisors is an integer number (3950623152).

Almost surely, 2^51251102765 is an apocalyptic number.

It is an amenable number.

51251102765 is a deficient number, since it is larger than the sum of its proper divisors (11958867667).

51251102765 is a wasteful number, since it uses less digits than its factorization.

51251102765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389316.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 51251102765 in words is "fifty-one billion, two hundred fifty-one million, one hundred two thousand, seven hundred sixty-five".