561999968 has 12 divisors (see below), whose sum is σ = 1106437500. Its totient is φ = 280999968.

The previous prime is 561999959. The next prime is 561999973. The reversal of 561999968 is 869999165.

It is a self number, because there is not a number n which added to its sum of digits gives 561999968.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8781218 + ... + 8781281.

It is an arithmetic number, because the mean of its divisors is an integer number (92203125).

Almost surely, 2^561999968 is an apocalyptic number.

It is an amenable number.

561999968 is a deficient number, since it is larger than the sum of its proper divisors (544437532).

561999968 is a wasteful number, since it uses less digits than its factorization.

561999968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17562509 (or 17562501 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 62.

The square root of 561999968 is about 23706.5385073401. The cubic root of 561999968 is about 825.2371368511.

The spelling of 561999968 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred sixty-eight".