551386660 has 48 divisors (see below), whose sum is σ = 1265564160. Its totient is φ = 200125440.

The previous prime is 551386651. The next prime is 551386673. The reversal of 551386660 is 66683155.

551386660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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, 131476 + ... + 135604.

It is an arithmetic number, because the mean of its divisors is an integer number (26365920).

Almost surely, 2^551386660 is an apocalyptic number.

It is an amenable number.

551386660 is an abundant number, since it is smaller than the sum of its proper divisors (714177500).

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

551386660 is a wasteful number, since it uses less digits than its factorization.

551386660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756 (or 4754 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 551386660 is about 23481.6238791102. The cubic root of 551386660 is about 820.0092503418.

The spelling of 551386660 in words is "five hundred fifty-one million, three hundred eighty-six thousand, six hundred sixty".