51143809220 has 48 divisors (see below), whose sum is σ = 122758530048. Its totient is φ = 17533107840.

The previous prime is 51143809219. The next prime is 51143809243. The reversal of 51143809220 is 2290834115.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1989650 + ... + 2015190.

It is an arithmetic number, because the mean of its divisors is an integer number (2557469376).

Almost surely, 2^51143809220 is an apocalyptic number.

It is an amenable number.

51143809220 is an abundant number, since it is smaller than the sum of its proper divisors (71614720828).

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

51143809220 is a wasteful number, since it uses less digits than its factorization.

51143809220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39860 (or 39858 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 51143809220 in words is "fifty-one billion, one hundred forty-three million, eight hundred nine thousand, two hundred twenty".