561646152478566 has 32 divisors (see below), whose sum is σ = 1248105195802080. Its totient is φ = 187214988948768.

The previous prime is 561646152478547. The next prime is 561646152478577. The reversal of 561646152478566 is 665874251646165.

561646152478566 is a `hidden beast` number, since 5 + 6 + 1 + 6 + 4 + 6 + 1 + 52 + 4 + 7 + 8 + 566 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 561646152478494 and 561646152478503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15421560 + ... + 36893316.

It is an arithmetic number, because the mean of its divisors is an integer number (39003287368815).

Almost surely, 2^{561646152478566} is an apocalyptic number.

561646152478566 is an abundant number, since it is smaller than the sum of its proper divisors (686459043323514).

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

561646152478566 is a wasteful number, since it uses less digits than its factorization.

561646152478566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21956165 (or 21956159 counting only the distinct ones).

The product of its digits is 1741824000, while the sum is 72.

The spelling of 561646152478566 in words is "five hundred sixty-one trillion, six hundred forty-six billion, one hundred fifty-two million, four hundred seventy-eight thousand, five hundred sixty-six".