561888878044636 has 24 divisors (see below), whose sum is σ = 1047888971458560. Its totient is φ = 263011815252912.

The previous prime is 561888878044603. The next prime is 561888878044649. The reversal of 561888878044636 is 636440878888165.

It is a super-2 number, since 2×561888878044636² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 561888878044636.

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, 64973270196 + ... + 64973278843.

It is an arithmetic number, because the mean of its divisors is an integer number (43662040477440).

Almost surely, 2^{561888878044636} is an apocalyptic number.

It is an amenable number.

561888878044636 is a deficient number, since it is larger than the sum of its proper divisors (486000093413924).

561888878044636 is a wasteful number, since it uses less digits than its factorization.

561888878044636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129946549113 (or 129946549111 counting only the distinct ones).

The product of its (nonzero) digits is 11890851840, while the sum is 82.

The spelling of 561888878044636 in words is "five hundred sixty-one trillion, eight hundred eighty-eight billion, eight hundred seventy-eight million, forty-four thousand, six hundred thirty-six".