51615685470261 has 32 divisors (see below), whose sum is σ = 76577777994240. Its totient is φ = 30660683947200.

The previous prime is 51615685470253. The next prime is 51615685470311. The reversal of 51615685470261 is 16207458651615.

It is a happy number.

It is not a de Polignac number, because 51615685470261 - 2³ = 51615685470253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51615685470061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44732751 + ... + 45872108.

It is an arithmetic number, because the mean of its divisors is an integer number (2393055562320).

Almost surely, 2^{51615685470261} is an apocalyptic number.

It is an amenable number.

51615685470261 is a deficient number, since it is larger than the sum of its proper divisors (24962092523979).

51615685470261 is a wasteful number, since it uses less digits than its factorization.

51615685470261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90605217.

The product of its (nonzero) digits is 12096000, while the sum is 57.

The spelling of 51615685470261 in words is "fifty-one trillion, six hundred fifteen billion, six hundred eighty-five million, four hundred seventy thousand, two hundred sixty-one".