551661516666 has 48 divisors (see below), whose sum is σ = 1314597682944. Its totient is φ = 166130469792.

The previous prime is 551661516647. The next prime is 551661516683. The reversal of 551661516666 is 666615166155.

551661516666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25069086 + ... + 25091081.

It is an arithmetic number, because the mean of its divisors is an integer number (27387451728).

Almost surely, 2^551661516666 is an apocalyptic number.

551661516666 is an abundant number, since it is smaller than the sum of its proper divisors (762936166278).

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

551661516666 is a wasteful number, since it uses less digits than its factorization.

551661516666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50160235 (or 50160232 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 54.

The spelling of 551661516666 in words is "five hundred fifty-one billion, six hundred sixty-one million, five hundred sixteen thousand, six hundred sixty-six".