51506660515 has 8 divisors (see below), whose sum is σ = 62354966688. Its totient is φ = 40840679040.

The previous prime is 51506660507. The next prime is 51506660531.

51506660515 is nontrivially palindromic in base 10.

51506660515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51506660515 - 2³ = 51506660507 is a prime.

It is a Duffinian 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, 45580551 + ... + 45581680.

It is an arithmetic number, because the mean of its divisors is an integer number (7794370836).

Almost surely, 2^51506660515 is an apocalyptic number.

51506660515 is a deficient number, since it is larger than the sum of its proper divisors (10848306173).

51506660515 is a wasteful number, since it uses less digits than its factorization.

51506660515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91162349.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51506660515 in words is "fifty-one billion, five hundred six million, six hundred sixty thousand, five hundred fifteen".