51110015665 has 8 divisors (see below), whose sum is σ = 61334866728. Its totient is φ = 40886113920.

The previous prime is 51110015647. The next prime is 51110015669. The reversal of 51110015665 is 56651001115.

It can be written as a sum of positive squares in 4 ways, for example, as 86434209 + 51023581456 = 9297^2 + 225884^2 .

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

It is not a de Polignac number, because 51110015665 - 2⁵ = 51110015633 is a prime.

It is a super-2 number, since 2×51110015665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51110015669) 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, 112956 + ... + 339085.

It is an arithmetic number, because the mean of its divisors is an integer number (7666858341).

Almost surely, 2^51110015665 is an apocalyptic number.

It is an amenable number.

51110015665 is a deficient number, since it is larger than the sum of its proper divisors (10224851063).

51110015665 is a wasteful number, since it uses less digits than its factorization.

51110015665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474659.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 51110015665 in words is "fifty-one billion, one hundred ten million, fifteen thousand, six hundred sixty-five".