561165664999 has 8 divisors (see below), whose sum is σ = 581311654560. Its totient is φ = 541327248000.

The previous prime is 561165664937. The next prime is 561165665003. The reversal of 561165664999 is 999466561165.

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 561165664999 - 2²¹ = 561163567847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561165664399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76889427 + ... + 76896724.

It is an arithmetic number, because the mean of its divisors is an integer number (72663956820).

Almost surely, 2^561165664999 is an apocalyptic number.

561165664999 is a deficient number, since it is larger than the sum of its proper divisors (20145989561).

561165664999 is a wasteful number, since it uses less digits than its factorization.

561165664999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153786281.

The product of its digits is 94478400, while the sum is 67.

The spelling of 561165664999 in words is "five hundred sixty-one billion, one hundred sixty-five million, six hundred sixty-four thousand, nine hundred ninety-nine".