561000660566 has 8 divisors (see below), whose sum is σ = 841913699760. Its totient is φ = 280362760648.

The previous prime is 561000660553. The next prime is 561000660617. The reversal of 561000660566 is 665066000165.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68779721 + ... + 68787876.

It is an arithmetic number, because the mean of its divisors is an integer number (105239212470).

Almost surely, 2^561000660566 is an apocalyptic number.

561000660566 is a deficient number, since it is larger than the sum of its proper divisors (280913039194).

561000660566 is a wasteful number, since it uses less digits than its factorization.

561000660566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137569638.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 561000660566 in words is "five hundred sixty-one billion, six hundred sixty thousand, five hundred sixty-six".