51261216215 has 12 divisors (see below), whose sum is σ = 67613968632. Its totient is φ = 37280884080.

The previous prime is 51261216199. The next prime is 51261216289.

51261216215 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51261216215 - 2⁴ = 51261216199 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 11 ways as a sum of consecutive naturals, for example, 42364037 + ... + 42365246.

It is an arithmetic number, because the mean of its divisors is an integer number (5634497386).

Almost surely, 2^51261216215 is an apocalyptic number.

51261216215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51261216215 is a deficient number, since it is larger than the sum of its proper divisors (16352752417).

51261216215 is a wasteful number, since it uses less digits than its factorization.

51261216215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84729310 (or 84729299 counting only the distinct ones).

The product of its digits is 7200, while the sum is 32.

The spelling of 51261216215 in words is "fifty-one billion, two hundred sixty-one million, two hundred sixteen thousand, two hundred fifteen".