51289020991680 has 112 divisors (see below), whose sum is σ = 162869447915520. Its totient is φ = 13674820819968.

The previous prime is 51289020991667. The next prime is 51289020991687. The reversal of 51289020991680 is 8619902098215.

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

It is not an unprimeable number, because it can be changed into a prime (51289020991687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1441527 + ... + 10230153.

Almost surely, 2^{51289020991680} is an apocalyptic number.

It is an amenable number.

51289020991680 is an abundant number, since it is smaller than the sum of its proper divisors (111580426923840).

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

51289020991680 is a wasteful number, since it uses less digits than its factorization.

51289020991680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8794726 (or 8794716 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 60.

The spelling of 51289020991680 in words is "fifty-one trillion, two hundred eighty-nine billion, twenty million, nine hundred ninety-one thousand, six hundred eighty".