51115506665166 has 24 divisors (see below), whose sum is σ = 110779432422984. Its totient is φ = 17034014839920.

The previous prime is 51115506665147. The next prime is 51115506665221. The reversal of 51115506665166 is 66156660551115.

It is a super-2 number, since 2×51115506665166² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 373878240 + ... + 374014931.

It is an arithmetic number, because the mean of its divisors is an integer number (4615809684291).

Almost surely, 2^{51115506665166} is an apocalyptic number.

51115506665166 is an abundant number, since it is smaller than the sum of its proper divisors (59663925757818).

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

51115506665166 is a wasteful number, since it uses less digits than its factorization.

51115506665166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747896976 (or 747896973 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 51115506665166 in words is "fifty-one trillion, one hundred fifteen billion, five hundred six million, six hundred sixty-five thousand, one hundred sixty-six".