561012666 has 16 divisors (see below), whose sum is σ = 1122794784. Its totient is φ = 186875984.

The previous prime is 561012659. The next prime is 561012703. The reversal of 561012666 is 666210165.

It is a super-2 number, since 2×561012666² = 629470422824855112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22356 + ... + 40271.

It is an arithmetic number, because the mean of its divisors is an integer number (70174674).

Almost surely, 2^561012666 is an apocalyptic number.

561012666 is an abundant number, since it is smaller than the sum of its proper divisors (561782118).

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

561012666 is a wasteful number, since it uses less digits than its factorization.

561012666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64125.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 561012666 is about 23685.7059426144. The cubic root of 561012666 is about 824.7536042880.

The spelling of 561012666 in words is "five hundred sixty-one million, twelve thousand, six hundred sixty-six".