51601571721160 has 16 divisors (see below), whose sum is σ = 116103536372700. Its totient is φ = 20640628688448.

The previous prime is 51601571721137. The next prime is 51601571721187. The reversal of 51601571721160 is 6112717510615.

It can be written as a sum of positive squares in 2 ways, for example, as 48372887423844 + 3228684297316 = 6955062^2 + 1796854^2 .

It is a super-3 number, since 3×51601571721160³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645019646475 + ... + 645019646554.

Almost surely, 2^{51601571721160} is an apocalyptic number.

It is an amenable number.

51601571721160 is an abundant number, since it is smaller than the sum of its proper divisors (64501964651540).

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

51601571721160 is a wasteful number, since it uses less digits than its factorization.

51601571721160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290039293040 (or 1290039293036 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 43.

The spelling of 51601571721160 in words is "fifty-one trillion, six hundred one billion, five hundred seventy-one million, seven hundred twenty-one thousand, one hundred sixty".