551616220 has 12 divisors (see below), whose sum is σ = 1158394104. Its totient is φ = 220646480.

The previous prime is 551616217. The next prime is 551616283. The reversal of 551616220 is 22616155.

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, 13790386 + ... + 13790425.

It is an arithmetic number, because the mean of its divisors is an integer number (96532842).

Almost surely, 2^551616220 is an apocalyptic number.

It is an amenable number.

551616220 is an abundant number, since it is smaller than the sum of its proper divisors (606777884).

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

551616220 is a wasteful number, since it uses less digits than its factorization.

551616220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27580820 (or 27580818 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 551616220 is about 23486.5114480631. The cubic root of 551616220 is about 820.1230332940.

It can be divided in two parts, 5516 and 16220, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 551616220 in words is "five hundred fifty-one million, six hundred sixteen thousand, two hundred twenty".