51556522565516 has 96 divisors (see below), whose sum is σ = 93416769718272. Its totient is φ = 24883305062400.

The previous prime is 51556522565501. The next prime is 51556522565531. The reversal of 51556522565516 is 61556522565515.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51556522565501) and next prime (51556522565531).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9517538840 + ... + 9517544256.

It is an arithmetic number, because the mean of its divisors is an integer number (973091351232).

Almost surely, 2^{51556522565516} is an apocalyptic number.

It is an amenable number.

51556522565516 is a deficient number, since it is larger than the sum of its proper divisors (41860247152756).

51556522565516 is a wasteful number, since it uses less digits than its factorization.

51556522565516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479 (or 7477 counting only the distinct ones).

The product of its digits is 67500000, while the sum is 59.

Subtracting 51556522565516 from its reverse (61556522565515), we obtain a palindrome (9999999999999).

The spelling of 51556522565516 in words is "fifty-one trillion, five hundred fifty-six billion, five hundred twenty-two million, five hundred sixty-five thousand, five hundred sixteen".