51361254289680 has 80 divisors (see below), whose sum is σ = 159323077968000. Its totient is φ = 13687457946624.

The previous prime is 51361254289663. The next prime is 51361254289691. The reversal of 51361254289680 is 8698245216315.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68976805 + ... + 69717444.

It is an arithmetic number, because the mean of its divisors is an integer number (1991538474600).

Almost surely, 2^{51361254289680} is an apocalyptic number.

It is an amenable number.

51361254289680 is an abundant number, since it is smaller than the sum of its proper divisors (107961823678320).

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

51361254289680 is a wasteful number, since it uses less digits than its factorization.

51361254289680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138695808 (or 138695802 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 60.

The spelling of 51361254289680 in words is "fifty-one trillion, three hundred sixty-one billion, two hundred fifty-four million, two hundred eighty-nine thousand, six hundred eighty".