51616615516 has 6 divisors (see below), whose sum is σ = 90329077160. Its totient is φ = 25808307756.

The previous prime is 51616615493. The next prime is 51616615553. The reversal of 51616615516 is 61551661615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6452076936 + ... + 6452076943.

Almost surely, 2^51616615516 is an apocalyptic number.

It is an amenable number.

51616615516 is a deficient number, since it is larger than the sum of its proper divisors (38712461644).

51616615516 is a wasteful number, since it uses less digits than its factorization.

51616615516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12904153883 (or 12904153881 counting only the distinct ones).

The product of its digits is 162000, while the sum is 43.

The spelling of 51616615516 in words is "fifty-one billion, six hundred sixteen million, six hundred fifteen thousand, five hundred sixteen".