51515371538616 has 32 divisors (see below), whose sum is σ = 129322820682000. Its totient is φ = 17100538268160.

The previous prime is 51515371538573. The next prime is 51515371538629. The reversal of 51515371538616 is 61683517351515.

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, 4453259391 + ... + 4453270958.

Almost surely, 2^{51515371538616} is an apocalyptic number.

It is an amenable number.

51515371538616 is an abundant number, since it is smaller than the sum of its proper divisors (77807449143384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51515371538616 is a wasteful number, since it uses less digits than its factorization.

51515371538616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8906530599 (or 8906530595 counting only the distinct ones).

The product of its digits is 11340000, while the sum is 57.

The spelling of 51515371538616 in words is "fifty-one trillion, five hundred fifteen billion, three hundred seventy-one million, five hundred thirty-eight thousand, six hundred sixteen".