51561302615 has 8 divisors (see below), whose sum is σ = 61874815248. Its totient is φ = 41248207360.

The previous prime is 51561302609. The next prime is 51561302629. The reversal of 51561302615 is 51620316515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51561302615 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 7 ways as a sum of consecutive naturals, for example, 337655 + ... + 465975.

It is an arithmetic number, because the mean of its divisors is an integer number (7734351906).

Almost surely, 2^51561302615 is an apocalyptic number.

51561302615 is a deficient number, since it is larger than the sum of its proper divisors (10313512633).

51561302615 is a wasteful number, since it uses less digits than its factorization.

51561302615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208689.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 51561302615 in words is "fifty-one billion, five hundred sixty-one million, three hundred two thousand, six hundred fifteen".