51005615165 has 8 divisors (see below), whose sum is σ = 61208117208. Its totient is φ = 40803572800.

The previous prime is 51005615149. The next prime is 51005615173. The reversal of 51005615165 is 56151650015.

It can be written as a sum of positive squares in 4 ways, for example, as 64673764 + 50940941401 = 8042^2 + 225701^2 .

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

It is not a de Polignac number, because 51005615165 - 2⁴ = 51005615149 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 7 ways as a sum of consecutive naturals, for example, 215639 + ... + 385371.

It is an arithmetic number, because the mean of its divisors is an integer number (7651014651).

Almost surely, 2^51005615165 is an apocalyptic number.

It is an amenable number.

51005615165 is a deficient number, since it is larger than the sum of its proper divisors (10202502043).

51005615165 is a wasteful number, since it uses less digits than its factorization.

51005615165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229839.

The product of its (nonzero) digits is 22500, while the sum is 35.

It can be divided in two parts, 5100 and 5615165, that added together give a palindrome (5620265).

The spelling of 51005615165 in words is "fifty-one billion, five million, six hundred fifteen thousand, one hundred sixty-five".