561611661616 has 10 divisors (see below), whose sum is σ = 1088122594412. Its totient is φ = 280805830800.

The previous prime is 561611661593. The next prime is 561611661697. The reversal of 561611661616 is 616166116165.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17550364410 + ... + 17550364441.

Almost surely, 2^561611661616 is an apocalyptic number.

It is an amenable number.

561611661616 is a deficient number, since it is larger than the sum of its proper divisors (526510932796).

561611661616 is a wasteful number, since it uses less digits than its factorization.

561611661616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35100728859 (or 35100728853 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The spelling of 561611661616 in words is "five hundred sixty-one billion, six hundred eleven million, six hundred sixty-one thousand, six hundred sixteen".