556530566 has 4 divisors (see below), whose sum is σ = 834795852. Its totient is φ = 278265282.

The previous prime is 556530551. The next prime is 556530587. The reversal of 556530566 is 665035655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665035655 = 5 ⋅133007131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139132640 + ... + 139132643.

It is an arithmetic number, because the mean of its divisors is an integer number (208698963).

Almost surely, 2^556530566 is an apocalyptic number.

556530566 is a deficient number, since it is larger than the sum of its proper divisors (278265286).

556530566 is a wasteful number, since it uses less digits than its factorization.

556530566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278265285.

The product of its (nonzero) digits is 405000, while the sum is 41.

The square root of 556530566 is about 23590.9000676108. The cubic root of 556530566 is about 822.5513268844.

It can be divided in two parts, 5565 and 30566, that multiplied together give a triangular number (170099790 = T₁₈₄₄₄).

The spelling of 556530566 in words is "five hundred fifty-six million, five hundred thirty thousand, five hundred sixty-six".