561287172525644 has 24 divisors (see below), whose sum is σ = 1000475143895808. Its totient is φ = 275471957198480.

The previous prime is 561287172525623. The next prime is 561287172525649. The reversal of 561287172525644 is 446525271782165.

It is a super-2 number, since 2×561287172525644² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561287172525649) 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, 4353158624 + ... + 4353287559.

It is an arithmetic number, because the mean of its divisors is an integer number (41686464328992).

Almost surely, 2^{561287172525644} is an apocalyptic number.

It is an amenable number.

561287172525644 is a deficient number, since it is larger than the sum of its proper divisors (439187971370164).

561287172525644 is a wasteful number, since it uses less digits than its factorization.

561287172525644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8706446485 (or 8706446483 counting only the distinct ones).

The product of its digits is 225792000, while the sum is 65.

The spelling of 561287172525644 in words is "five hundred sixty-one trillion, two hundred eighty-seven billion, one hundred seventy-two million, five hundred twenty-five thousand, six hundred forty-four".