556009966 has 4 divisors (see below), whose sum is σ = 834014952. Its totient is φ = 278004982.

The previous prime is 556009963. The next prime is 556009969. The reversal of 556009966 is 669900655.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (556009963) and next prime (556009969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556009963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139002490 + ... + 139002493.

It is an arithmetic number, because the mean of its divisors is an integer number (208503738).

Almost surely, 2^556009966 is an apocalyptic number.

556009966 is a deficient number, since it is larger than the sum of its proper divisors (278004986).

556009966 is a wasteful number, since it uses less digits than its factorization.

556009966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278004985.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 556009966 is about 23579.8635704281. The cubic root of 556009966 is about 822.2947648668.

The spelling of 556009966 in words is "five hundred fifty-six million, nine thousand, nine hundred sixty-six".