561423173378738 has 32 divisors (see below), whose sum is σ = 926210567559168. Its totient is φ = 253105223817600.

The previous prime is 561423173378707. The next prime is 561423173378783. The reversal of 561423173378738 is 837873371324165.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 21747173 + ... + 39947288.

It is an arithmetic number, because the mean of its divisors is an integer number (28944080236224).

Almost surely, 2^{561423173378738} is an apocalyptic number.

561423173378738 is a deficient number, since it is larger than the sum of its proper divisors (364787394180430).

561423173378738 is a wasteful number, since it uses less digits than its factorization.

561423173378738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61697858.

The product of its digits is 426746880, while the sum is 68.

The spelling of 561423173378738 in words is "five hundred sixty-one trillion, four hundred twenty-three billion, one hundred seventy-three million, three hundred seventy-eight thousand, seven hundred thirty-eight".