51321665024 has 120 divisors (see below), whose sum is σ = 124493780400. Its totient is φ = 20700758016.

The previous prime is 51321664981. The next prime is 51321665039. The reversal of 51321665024 is 42056612315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1011002 + ... + 1060550.

It is an arithmetic number, because the mean of its divisors is an integer number (1037448170).

Almost surely, 2^51321665024 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 51321665024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62246890200).

51321665024 is an abundant number, since it is smaller than the sum of its proper divisors (73172115376).

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

51321665024 is an equidigital number, since it uses as much as digits as its factorization.

51321665024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49608 (or 49575 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 51321665024 in words is "fifty-one billion, three hundred twenty-one million, six hundred sixty-five thousand, twenty-four".