51617671615 has 4 divisors (see below), whose sum is σ = 61941205944. Its totient is φ = 41294137288.

The previous prime is 51617671613. The next prime is 51617671643.

51617671615 is nontrivially palindromic in base 10.

51617671615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51617671615 - 2¹ = 51617671613 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 (51617671613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161767157 + ... + 5161767166.

It is an arithmetic number, because the mean of its divisors is an integer number (15485301486).

Almost surely, 2^51617671615 is an apocalyptic number.

51617671615 is a deficient number, since it is larger than the sum of its proper divisors (10323534329).

51617671615 is a wasteful number, since it uses less digits than its factorization.

51617671615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323534328.

The product of its digits is 264600, while the sum is 46.

The spelling of 51617671615 in words is "fifty-one billion, six hundred seventeen million, six hundred seventy-one thousand, six hundred fifteen".