556055551 has 4 divisors (see below), whose sum is σ = 558850000. Its totient is φ = 553261104.

The previous prime is 556055509. The next prime is 556055561. The reversal of 556055551 is 155550655.

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 556055551 - 2¹¹ = 556053503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 556055551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556055561) 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, 1396926 + ... + 1397323.

It is an arithmetic number, because the mean of its divisors is an integer number (139712500).

Almost surely, 2^556055551 is an apocalyptic number.

556055551 is a deficient number, since it is larger than the sum of its proper divisors (2794449).

556055551 is a wasteful number, since it uses less digits than its factorization.

556055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794448.

The product of its (nonzero) digits is 93750, while the sum is 37.

The square root of 556055551 is about 23580.8301592628. The cubic root of 556055551 is about 822.3172364559.

The spelling of 556055551 in words is "five hundred fifty-six million, fifty-five thousand, five hundred fifty-one".