555972561 has 12 divisors (see below), whose sum is σ = 803342800. Its totient is φ = 370523160.

The previous prime is 555972553. The next prime is 555972563. The reversal of 555972561 is 165279555.

555972561 is a `hidden beast` number, since 5 + 5 + 597 + 2 + 56 + 1 = 666.

555972561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 555972561 - 2³ = 555972553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555972563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23490 + ... + 40788.

Almost surely, 2^555972561 is an apocalyptic number.

It is an amenable number.

555972561 is a deficient number, since it is larger than the sum of its proper divisors (247370239).

555972561 is a wasteful number, since it uses less digits than its factorization.

555972561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20876 (or 20873 counting only the distinct ones).

The product of its digits is 472500, while the sum is 45.

The square root of 555972561 is about 23579.0704015235. The cubic root of 555972561 is about 822.2763247744.

The spelling of 555972561 in words is "five hundred fifty-five million, nine hundred seventy-two thousand, five hundred sixty-one".