51991225854696 has 96 divisors (see below), whose sum is σ = 142848033082560. Its totient is φ = 17079885317376.

The previous prime is 51991225854649. The next prime is 51991225854751. The reversal of 51991225854696 is 69645852219915.

51991225854696 is a `hidden beast` number, since 5 + 1 + 9 + 9 + 1 + 22 + 58 + 546 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3052795 + ... + 10644341.

It is an arithmetic number, because the mean of its divisors is an integer number (1488000344610).

Almost surely, 2^{51991225854696} 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 51991225854696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71424016541280).

51991225854696 is an abundant number, since it is smaller than the sum of its proper divisors (90856807227864).

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

51991225854696 is a wasteful number, since it uses less digits than its factorization.

51991225854696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7592935 (or 7592928 counting only the distinct ones).

The product of its digits is 419904000, while the sum is 72.

The spelling of 51991225854696 in words is "fifty-one trillion, nine hundred ninety-one billion, two hundred twenty-five million, eight hundred fifty-four thousand, six hundred ninety-six".