51921092016 has 200 divisors, whose sum is σ = 156640799744. Its totient is φ = 16584808320.

The previous prime is 51921091993. The next prime is 51921092017. The reversal of 51921092016 is 61029012915.

51921092016 is a `hidden beast` number, since 519 + 2 + 109 + 20 + 16 = 666.

It is a super-2 number, since 2×51921092016² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51921092017) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4131855 + ... + 4144401.

Almost surely, 2^51921092016 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 51921092016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78320399872).

51921092016 is an abundant number, since it is smaller than the sum of its proper divisors (104719707728).

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

51921092016 is a wasteful number, since it uses less digits than its factorization.

51921092016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12701 (or 12686 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 51921092016 in words is "fifty-one billion, nine hundred twenty-one million, ninety-two thousand, sixteen".