561165664998 has 16 divisors (see below), whose sum is σ = 1122342522480. Its totient is φ = 187053356256.

The previous prime is 561165664937. The next prime is 561165665003. The reversal of 561165664998 is 899466561165.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276448 + ... + 1094876.

It is an arithmetic number, because the mean of its divisors is an integer number (70146407655).

Almost surely, 2^561165664998 is an apocalyptic number.

561165664998 is an abundant number, since it is smaller than the sum of its proper divisors (561176857482).

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

561165664998 is a wasteful number, since it uses less digits than its factorization.

561165664998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932711.

The product of its digits is 83980800, while the sum is 66.

The spelling of 561165664998 in words is "five hundred sixty-one billion, one hundred sixty-five million, six hundred sixty-four thousand, nine hundred ninety-eight".