51708165488640 has 1152 divisors, whose sum is σ = 190675687910400. Its totient is φ = 13452120686592.

The previous prime is 51708165488587. The next prime is 51708165488747. The reversal of 51708165488640 is 4688456180715.

It is a happy number.

51708165488640 is a `hidden beast` number, since 5 + 1 + 7 + 0 + 8 + 1 + 6 + 548 + 86 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 61630709341 + ... + 61630710179.

It is an arithmetic number, because the mean of its divisors is an integer number (165517090200).

Almost surely, 2^{51708165488640} 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 51708165488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95337843955200).

51708165488640 is an abundant number, since it is smaller than the sum of its proper divisors (138967522421760).

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

51708165488640 is an frugal number, since it uses more digits than its factorization.

51708165488640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 63.

The spelling of 51708165488640 in words is "fifty-one trillion, seven hundred eight billion, one hundred sixty-five million, four hundred eighty-eight thousand, six hundred forty".