51513302215 has 4 divisors (see below), whose sum is σ = 61815962664. Its totient is φ = 41210641768.

The previous prime is 51513302209. The next prime is 51513302251. The reversal of 51513302215 is 51220331515.

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 51513302215 - 2⁹ = 51513301703 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 3 ways as a sum of consecutive naturals, for example, 5151330217 + ... + 5151330226.

It is an arithmetic number, because the mean of its divisors is an integer number (15453990666).

Almost surely, 2^51513302215 is an apocalyptic number.

51513302215 is a deficient number, since it is larger than the sum of its proper divisors (10302660449).

51513302215 is a wasteful number, since it uses less digits than its factorization.

51513302215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10302660448.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 51513302215 in words is "fifty-one billion, five hundred thirteen million, three hundred two thousand, two hundred fifteen".