51251612065 has 8 divisors (see below), whose sum is σ = 62932212288. Its totient is φ = 40047771120.

The previous prime is 51251612063. The next prime is 51251612081. The reversal of 51251612065 is 56021615215.

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

It is not a de Polignac number, because 51251612065 - 2¹ = 51251612063 is a prime.

It is a super-2 number, since 2×51251612065² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51251612065.

It is not an unprimeable number, because it can be changed into a prime (51251612063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119189581 + ... + 119190010.

It is an arithmetic number, because the mean of its divisors is an integer number (7866526536).

Almost surely, 2^51251612065 is an apocalyptic number.

It is an amenable number.

51251612065 is a deficient number, since it is larger than the sum of its proper divisors (11680600223).

51251612065 is a wasteful number, since it uses less digits than its factorization.

51251612065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238379639.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 51251612065 in words is "fifty-one billion, two hundred fifty-one million, six hundred twelve thousand, sixty-five".