561197693666 has 8 divisors (see below), whose sum is σ = 862328163564. Its totient is φ = 273754972480.

The previous prime is 561197693659. The next prime is 561197693669. The reversal of 561197693666 is 666396791165.

It can be written as a sum of positive squares in 2 ways, for example, as 557643030025 + 3554663641 = 746755^2 + 59621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (561197693669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3421937075 + ... + 3421937238.

Almost surely, 2^561197693666 is an apocalyptic number.

561197693666 is a deficient number, since it is larger than the sum of its proper divisors (301130469898).

561197693666 is a wasteful number, since it uses less digits than its factorization.

561197693666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6843874356.

The product of its digits is 66134880, while the sum is 65.

The spelling of 561197693666 in words is "five hundred sixty-one billion, one hundred ninety-seven million, six hundred ninety-three thousand, six hundred sixty-six".