556920009 has 8 divisors (see below), whose sum is σ = 825066720. Its totient is φ = 371279988.

The previous prime is 556919947. The next prime is 556920037. The reversal of 556920009 is 900029655.

It is not a de Polignac number, because 556920009 - 2²⁴ = 540142793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556920809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10313307 + ... + 10313360.

It is an arithmetic number, because the mean of its divisors is an integer number (103133340).

Almost surely, 2^556920009 is an apocalyptic number.

It is an amenable number.

556920009 is a deficient number, since it is larger than the sum of its proper divisors (268146711).

556920009 is a wasteful number, since it uses less digits than its factorization.

556920009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20626676 (or 20626670 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 556920009 is about 23599.1527178414. The cubic root of 556920009 is about 822.7431475345.

The spelling of 556920009 in words is "five hundred fifty-six million, nine hundred twenty thousand, nine".