51689761992960 has 864 divisors, whose sum is σ = 216314690538240. Its totient is φ = 10264428675072.

The previous prime is 51689761992917. The next prime is 51689761993019. The reversal of 51689761992960 is 6929916798615.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 76891576 + ... + 77560904.

It is an arithmetic number, because the mean of its divisors is an integer number (250364225160).

Almost surely, 2^{51689761992960} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51689761992960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108157345269120).

51689761992960 is an abundant number, since it is smaller than the sum of its proper divisors (164624928545280).

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

51689761992960 is a wasteful number, since it uses less digits than its factorization.

51689761992960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669403 (or 669376 counting only the distinct ones).

The product of its (nonzero) digits is 793618560, while the sum is 78.

The spelling of 51689761992960 in words is "fifty-one trillion, six hundred eighty-nine billion, seven hundred sixty-one million, nine hundred ninety-two thousand, nine hundred sixty".