51980219856 has 40 divisors (see below), whose sum is σ = 149202484160. Its totient is φ = 17326739808.

The previous prime is 51980219843. The next prime is 51980219861. The reversal of 51980219856 is 65891208915.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 60161860 + ... + 60162723.

It is an arithmetic number, because the mean of its divisors is an integer number (3730062104).

Almost surely, 2^51980219856 is an apocalyptic number.

It is an amenable number.

51980219856 is an abundant number, since it is smaller than the sum of its proper divisors (97222264304).

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

51980219856 is a wasteful number, since it uses less digits than its factorization.

51980219856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120324600 (or 120324588 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 51980219856 in words is "fifty-one billion, nine hundred eighty million, two hundred nineteen thousand, eight hundred fifty-six".