51205687624 has 128 divisors (see below), whose sum is σ = 125717356800. Its totient is φ = 18974269440.

The previous prime is 51205687609. The next prime is 51205687633. The reversal of 51205687624 is 42678650215.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2601532 + ... + 2621140.

It is an arithmetic number, because the mean of its divisors is an integer number (982166850).

Almost surely, 2^51205687624 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 51205687624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62858678400).

51205687624 is an abundant number, since it is smaller than the sum of its proper divisors (74511669176).

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

51205687624 is a wasteful number, since it uses less digits than its factorization.

51205687624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19863 (or 19859 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 51205687624 in words is "fifty-one billion, two hundred five million, six hundred eighty-seven thousand, six hundred twenty-four".