51621344312615 has 32 divisors (see below), whose sum is σ = 77232013553664. Its totient is φ = 32179072976640.

The previous prime is 51621344312611. The next prime is 51621344312617.

51621344312615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51621344312615 - 2² = 51621344312611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621344312611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26648387 + ... + 28519803.

It is an arithmetic number, because the mean of its divisors is an integer number (2413500423552).

Almost surely, 2^{51621344312615} is an apocalyptic number.

51621344312615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51621344312615 is a deficient number, since it is larger than the sum of its proper divisors (25610669241049).

51621344312615 is a wasteful number, since it uses less digits than its factorization.

51621344312615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943087.

The product of its digits is 518400, while the sum is 44.

It can be divided in two parts, 5162134 and 4312615, that added together give a palindrome (9474749).

The spelling of 51621344312615 in words is "fifty-one trillion, six hundred twenty-one billion, three hundred forty-four million, three hundred twelve thousand, six hundred fifteen".