561255645007764 has 36 divisors (see below), whose sum is σ = 1621405196689824. Its totient is φ = 160358755716432.

The previous prime is 561255645007691. The next prime is 561255645007781. The reversal of 561255645007764 is 467700546552165.

561255645007764 is a `hidden beast` number, since 5 + 6 + 1 + 2 + 5 + 5 + 64 + 500 + 7 + 7 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1113602470002 + ... + 1113602470505.

It is an arithmetic number, because the mean of its divisors is an integer number (45039033241384).

Almost surely, 2^{561255645007764} is an apocalyptic number.

It is an amenable number.

561255645007764 is an abundant number, since it is smaller than the sum of its proper divisors (1060149551682060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561255645007764 is a wasteful number, since it uses less digits than its factorization.

561255645007764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227204940524 (or 2227204940519 counting only the distinct ones).

The product of its (nonzero) digits is 211680000, while the sum is 63.

The spelling of 561255645007764 in words is "five hundred sixty-one trillion, two hundred fifty-five billion, six hundred forty-five million, seven thousand, seven hundred sixty-four".