561812797885 has 8 divisors (see below), whose sum is σ = 674196227640. Its totient is φ = 449436324864.

The previous prime is 561812797877. The next prime is 561812797907. The reversal of 561812797885 is 588797218165.

It can be written as a sum of positive squares in 4 ways, for example, as 168118040484 + 393694757401 = 410022^2 + 627451^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561812797885 - 2³ = 561812797877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561812797885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1559832 + ... + 1885921.

It is an arithmetic number, because the mean of its divisors is an integer number (84274528455).

Almost surely, 2^561812797885 is an apocalyptic number.

It is an amenable number.

561812797885 is a deficient number, since it is larger than the sum of its proper divisors (112383429755).

561812797885 is a wasteful number, since it uses less digits than its factorization.

561812797885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478367.

The product of its digits is 67737600, while the sum is 67.

The spelling of 561812797885 in words is "five hundred sixty-one billion, eight hundred twelve million, seven hundred ninety-seven thousand, eight hundred eighty-five".