561465666 has 48 divisors (see below), whose sum is σ = 1254883968. Its totient is φ = 181332000.

The previous prime is 561465617. The next prime is 561465679. The reversal of 561465666 is 666564165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82161 + ... + 88731.

It is an arithmetic number, because the mean of its divisors is an integer number (26143416).

Almost surely, 2^561465666 is an apocalyptic number.

561465666 is an abundant number, since it is smaller than the sum of its proper divisors (693418302).

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

561465666 is a wasteful number, since it uses less digits than its factorization.

561465666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727 (or 6724 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 561465666 is about 23695.2667425374. The cubic root of 561465666 is about 824.9755320567.

The spelling of 561465666 in words is "five hundred sixty-one million, four hundred sixty-five thousand, six hundred sixty-six".