561172838945 has 16 divisors (see below), whose sum is σ = 691685755968. Its totient is φ = 436755447360.

The previous prime is 561172838929. The next prime is 561172838951. The reversal of 561172838945 is 549838271165.

It is not a de Polignac number, because 561172838945 - 2⁴ = 561172838929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1515002 + ... + 1848668.

It is an arithmetic number, because the mean of its divisors is an integer number (43230359748).

Almost surely, 2^561172838945 is an apocalyptic number.

It is an amenable number.

561172838945 is a deficient number, since it is larger than the sum of its proper divisors (130512917023).

561172838945 is a wasteful number, since it uses less digits than its factorization.

561172838945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342800.

The product of its digits is 14515200, while the sum is 59.

The spelling of 561172838945 in words is "five hundred sixty-one billion, one hundred seventy-two million, eight hundred thirty-eight thousand, nine hundred forty-five".