51660771563520 has 1152 divisors, whose sum is σ = 216550037995200. Its totient is φ = 11646197563392.

The previous prime is 51660771563497. The next prime is 51660771563603. The reversal of 51660771563520 is 2536517706615.

51660771563520 is a `hidden beast` number, since 5 + 1 + 6 + 6 + 0 + 7 + 71 + 563 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 988942842 + ... + 988995078.

Almost surely, 2^{51660771563520} 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 51660771563520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108275018997600).

51660771563520 is an abundant number, since it is smaller than the sum of its proper divisors (164889266431680).

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

51660771563520 is a wasteful number, since it uses less digits than its factorization.

51660771563520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52360 (or 52327 counting only the distinct ones).

The product of its (nonzero) digits is 7938000, while the sum is 54.

The spelling of 51660771563520 in words is "fifty-one trillion, six hundred sixty billion, seven hundred seventy-one million, five hundred sixty-three thousand, five hundred twenty".