556440623 has 4 divisors (see below), whose sum is σ = 565871880. Its totient is φ = 547009368.

The previous prime is 556440611. The next prime is 556440637. The reversal of 556440623 is 326044655.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 556440623 - 2¹⁶ = 556375087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556440223) 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, 4715540 + ... + 4715657.

It is an arithmetic number, because the mean of its divisors is an integer number (141467970).

Almost surely, 2^556440623 is an apocalyptic number.

556440623 is a deficient number, since it is larger than the sum of its proper divisors (9431257).

556440623 is an equidigital number, since it uses as much as digits as its factorization.

556440623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9431256.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 556440623 is about 23588.9936834957. The cubic root of 556440623 is about 822.5070126249.

The spelling of 556440623 in words is "five hundred fifty-six million, four hundred forty thousand, six hundred twenty-three".