561666055602 has 32 divisors (see below), whose sum is σ = 1135169697024. Its totient is φ = 185257326800.

The previous prime is 561666055543. The next prime is 561666055663. The reversal of 561666055602 is 206550666165.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 756924 + ... + 1302407.

It is an arithmetic number, because the mean of its divisors is an integer number (35474053032).

Almost surely, 2^561666055602 is an apocalyptic number.

561666055602 is an abundant number, since it is smaller than the sum of its proper divisors (573503641422).

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

561666055602 is a wasteful number, since it uses less digits than its factorization.

561666055602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059814.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 561666055602 in words is "five hundred sixty-one billion, six hundred sixty-six million, fifty-five thousand, six hundred two".