51640916140 has 48 divisors (see below), whose sum is σ = 121190144544. Its totient is φ = 18320499200.

The previous prime is 51640916123. The next prime is 51640916141. The reversal of 51640916140 is 4161904615.

It is a self number, because there is not a number n which added to its sum of digits gives 51640916140.

It is not an unprimeable number, because it can be changed into a prime (51640916141) 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, 2853559 + ... + 2871598.

It is an arithmetic number, because the mean of its divisors is an integer number (2524794678).

Almost surely, 2^51640916140 is an apocalyptic number.

It is an amenable number.

51640916140 is an abundant number, since it is smaller than the sum of its proper divisors (69549228404).

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

51640916140 is a wasteful number, since it uses less digits than its factorization.

51640916140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725218 (or 5725216 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 51640916140 in words is "fifty-one billion, six hundred forty million, nine hundred sixteen thousand, one hundred forty".