576557561 has 4 divisors (see below), whose sum is σ = 595156224. Its totient is φ = 557958900.

The previous prime is 576557551. The next prime is 576557573. The reversal of 576557561 is 165755675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 576557561 - 2¹⁴ = 576541177 is a prime.

It is a super-2 number, since 2×576557561² = 664837242292537442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (576557551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9299285 + ... + 9299346.

It is an arithmetic number, because the mean of its divisors is an integer number (148789056).

Almost surely, 2^576557561 is an apocalyptic number.

It is an amenable number.

576557561 is a deficient number, since it is larger than the sum of its proper divisors (18598663).

576557561 is a wasteful number, since it uses less digits than its factorization.

576557561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18598662.

The product of its digits is 1102500, while the sum is 47.

The square root of 576557561 is about 24011.6130445249. The cubic root of 576557561 is about 832.3019087583.

The spelling of 576557561 in words is "five hundred seventy-six million, five hundred fifty-seven thousand, five hundred sixty-one".