561543003774766 has 16 divisors (see below), whose sum is σ = 954850451763600. Its totient is φ = 245532973310208.

The previous prime is 561543003774751. The next prime is 561543003774799. The reversal of 561543003774766 is 667477300345165.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 561543003774698 and 561543003774707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568363363651 + ... + 568363364638.

It is an arithmetic number, because the mean of its divisors is an integer number (59678153235225).

Almost surely, 2^{561543003774766} is an apocalyptic number.

561543003774766 is a deficient number, since it is larger than the sum of its proper divisors (393307447988834).

561543003774766 is a wasteful number, since it uses less digits than its factorization.

561543003774766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136726728323.

The product of its (nonzero) digits is 266716800, while the sum is 64.

The spelling of 561543003774766 in words is "five hundred sixty-one trillion, five hundred forty-three billion, three million, seven hundred seventy-four thousand, seven hundred sixty-six".