51616011661165 has 24 divisors (see below), whose sum is σ = 72104447123712. Its totient is φ = 35367944724000.

The previous prime is 51616011661147. The next prime is 51616011661171. The reversal of 51616011661165 is 56116611061615.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-51616011661165 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 23 ways as a sum of consecutive naturals, for example, 76723461 + ... + 77393290.

It is an arithmetic number, because the mean of its divisors is an integer number (3004351963488).

Almost surely, 2^{51616011661165} is an apocalyptic number.

It is an amenable number.

51616011661165 is a deficient number, since it is larger than the sum of its proper divisors (20488435462547).

51616011661165 is a wasteful number, since it uses less digits than its factorization.

51616011661165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154118137 (or 154118130 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 51616011661165 in words is "fifty-one trillion, six hundred sixteen billion, eleven million, six hundred sixty-one thousand, one hundred sixty-five".