51405591252 has 24 divisors (see below), whose sum is σ = 121635767232. Its totient is φ = 16893856000.

The previous prime is 51405591241. The next prime is 51405591337. The reversal of 51405591252 is 25219550415.

It is a self number, because there is not a number n which added to its sum of digits gives 51405591252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30166749 + ... + 30168452.

It is an arithmetic number, because the mean of its divisors is an integer number (5068156968).

Almost surely, 2^51405591252 is an apocalyptic number.

It is an amenable number.

51405591252 is an abundant number, since it is smaller than the sum of its proper divisors (70230175980).

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

51405591252 is a wasteful number, since it uses less digits than its factorization.

51405591252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60335279 (or 60335277 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 51405591252 in words is "fifty-one billion, four hundred five million, five hundred ninety-one thousand, two hundred fifty-two".