51550442220 has 48 divisors (see below), whose sum is σ = 144517187808. Its totient is φ = 13730027520.

The previous prime is 51550442123. The next prime is 51550442267. The reversal of 51550442220 is 2224405515.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 473989 + ... + 572508.

It is an arithmetic number, because the mean of its divisors is an integer number (3010774746).

Almost surely, 2^51550442220 is an apocalyptic number.

It is an amenable number.

51550442220 is an abundant number, since it is smaller than the sum of its proper divisors (92966745588).

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

51550442220 is a wasteful number, since it uses less digits than its factorization.

51550442220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047330 (or 1047328 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 51550442220 its reverse (2224405515), we get a palindrome (53774847735).

The spelling of 51550442220 in words is "fifty-one billion, five hundred fifty million, four hundred forty-two thousand, two hundred twenty".