51381851120 has 20 divisors (see below), whose sum is σ = 119462804040. Its totient is φ = 20552740416.

The previous prime is 51381851021. The next prime is 51381851173. The reversal of 51381851120 is 2115818315.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321136490 + ... + 321136649.

It is an arithmetic number, because the mean of its divisors is an integer number (5973140202).

Almost surely, 2^51381851120 is an apocalyptic number.

It is an amenable number.

51381851120 is an abundant number, since it is smaller than the sum of its proper divisors (68080952920).

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

51381851120 is a wasteful number, since it uses less digits than its factorization.

51381851120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642273152 (or 642273146 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 35.

The spelling of 51381851120 in words is "fifty-one billion, three hundred eighty-one million, eight hundred fifty-one thousand, one hundred twenty".