561772017261 has 96 divisors (see below), whose sum is σ = 1004702130432. Its totient is φ = 294544926720.

The previous prime is 561772017251. The next prime is 561772017299. The reversal of 561772017261 is 162710277165.

561772017261 is a `hidden beast` number, since 5 + 617 + 7 + 2 + 0 + 1 + 7 + 26 + 1 = 666.

It is not a de Polignac number, because 561772017261 - 2⁵ = 561772017229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561772017251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 120991006 + ... + 120995648.

It is an arithmetic number, because the mean of its divisors is an integer number (10465647192).

Almost surely, 2^561772017261 is an apocalyptic number.

It is an amenable number.

561772017261 is a deficient number, since it is larger than the sum of its proper divisors (442930113171).

561772017261 is a wasteful number, since it uses less digits than its factorization.

561772017261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5523 (or 5520 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 561772017261 in words is "five hundred sixty-one billion, seven hundred seventy-two million, seventeen thousand, two hundred sixty-one".