51261816215 has 16 divisors (see below), whose sum is σ = 64062468000. Its totient is φ = 39329576832.

The previous prime is 51261816211. The next prime is 51261816239.

51261816215 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 51261816215 - 2² = 51261816211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261816211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164737 + ... + 1207946.

It is an arithmetic number, because the mean of its divisors is an integer number (4003904250).

Almost surely, 2^51261816215 is an apocalyptic number.

51261816215 is a deficient number, since it is larger than the sum of its proper divisors (12800651785).

51261816215 is a wasteful number, since it uses less digits than its factorization.

51261816215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372866.

The product of its digits is 28800, while the sum is 38.

The spelling of 51261816215 in words is "fifty-one billion, two hundred sixty-one million, eight hundred sixteen thousand, two hundred fifteen".