566540491 has 24 divisors (see below), whose sum is σ = 654211584. Its totient is φ = 486323040.

The previous prime is 566540477. The next prime is 566540503. The reversal of 566540491 is 194045665.

It is a happy number.

It is not a de Polignac number, because 566540491 - 2⁵ = 566540459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566540291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 434146 + ... + 435448.

It is an arithmetic number, because the mean of its divisors is an integer number (27258816).

Almost surely, 2^566540491 is an apocalyptic number.

566540491 is a deficient number, since it is larger than the sum of its proper divisors (87671093).

566540491 is a wasteful number, since it uses less digits than its factorization.

566540491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1390 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 566540491 is about 23802.1110618365. Note that the first 3 decimals coincide. The cubic root of 566540491 is about 827.4536033351.

The spelling of 566540491 in words is "five hundred sixty-six million, five hundred forty thousand, four hundred ninety-one".