51661692546048 has 2640 divisors, whose sum is σ = 191579125709664. Its totient is φ = 13725015736320.

The previous prime is 51661692546001. The next prime is 51661692546059. The reversal of 51661692546048 is 84064529616615.

51661692546048 is a `hidden beast` number, since 5 + 1 + 6 + 6 + 16 + 9 + 2 + 5 + 4 + 604 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 244842144663 + ... + 244842144873.

Almost surely, 2^{51661692546048} 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 51661692546048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95789562854832).

51661692546048 is an abundant number, since it is smaller than the sum of its proper divisors (139917433163616).

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

51661692546048 is a wasteful number, since it uses less digits than its factorization.

51661692546048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 74649600, while the sum is 63.

The spelling of 51661692546048 in words is "fifty-one trillion, six hundred sixty-one billion, six hundred ninety-two million, five hundred forty-six thousand, forty-eight".