51371953920 has 576 divisors, whose sum is σ = 210061716480. Its totient is φ = 11645337600.

The previous prime is 51371953903. The next prime is 51371953939. The reversal of 51371953920 is 2935917315.

51371953920 is a `hidden beast` number, since 51 + 37 + 19 + 539 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31690710 + ... + 31692330.

It is an arithmetic number, because the mean of its divisors is an integer number (364690480).

Almost surely, 2^51371953920 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 51371953920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105030858240).

51371953920 is an abundant number, since it is smaller than the sum of its proper divisors (158689762560).

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

51371953920 is a wasteful number, since it uses less digits than its factorization.

51371953920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The spelling of 51371953920 in words is "fifty-one billion, three hundred seventy-one million, nine hundred fifty-three thousand, nine hundred twenty".