51505605015 has 32 divisors (see below), whose sum is σ = 83198361600. Its totient is φ = 27207258624.

The previous prime is 51505604971. The next prime is 51505605031. The reversal of 51505605015 is 51050650515.

It is not a de Polignac number, because 51505605015 - 2¹³ = 51505596823 is a prime.

It is a super-2 number, since 2×51505605015² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1118527 + ... + 1163663.

It is an arithmetic number, because the mean of its divisors is an integer number (2599948800).

Almost surely, 2^51505605015 is an apocalyptic number.

51505605015 is a deficient number, since it is larger than the sum of its proper divisors (31692756585).

51505605015 is a wasteful number, since it uses less digits than its factorization.

51505605015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45871.

The product of its (nonzero) digits is 18750, while the sum is 33.

It can be divided in two parts, 5150 and 5605015, that added together give a palindrome (5610165).

The spelling of 51505605015 in words is "fifty-one billion, five hundred five million, six hundred five thousand, fifteen".