505656566 has 4 divisors (see below), whose sum is σ = 758484852. Its totient is φ = 252828282.

The previous prime is 505656553. The next prime is 505656583. The reversal of 505656566 is 665656505.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126414140 + ... + 126414143.

It is an arithmetic number, because the mean of its divisors is an integer number (189621213).

Almost surely, 2^505656566 is an apocalyptic number.

505656566 is a deficient number, since it is larger than the sum of its proper divisors (252828286).

505656566 is a wasteful number, since it uses less digits than its factorization.

505656566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252828285.

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 505656566 is about 22486.8087108865. The cubic root of 505656566 is about 796.6823889647.

The spelling of 505656566 in words is "five hundred five million, six hundred fifty-six thousand, five hundred sixty-six".