51311107865 has 8 divisors (see below), whose sum is σ = 61576264968. Its totient is φ = 41046929280.

The previous prime is 51311107847. The next prime is 51311107873. The reversal of 51311107865 is 56870111315.

It can be written as a sum of positive squares in 4 ways, for example, as 6997489801 + 44313618064 = 83651^2 + 210508^2 .

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

It is not a de Polignac number, because 51311107865 - 2¹⁶ = 51311042329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123842 + ... + 343451.

It is an arithmetic number, because the mean of its divisors is an integer number (7697033121).

Almost surely, 2^51311107865 is an apocalyptic number.

It is an amenable number.

51311107865 is a deficient number, since it is larger than the sum of its proper divisors (10265157103).

51311107865 is a wasteful number, since it uses less digits than its factorization.

51311107865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489259.

The product of its (nonzero) digits is 25200, while the sum is 38.

The spelling of 51311107865 in words is "fifty-one billion, three hundred eleven million, one hundred seven thousand, eight hundred sixty-five".