556155551 has 4 divisors (see below), whose sum is σ = 635606352. Its totient is φ = 476704752.

The previous prime is 556155539. The next prime is 556155557. The reversal of 556155551 is 155551655.

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 556155551 - 2¹⁰ = 556154527 is a prime.

It is a super-2 number, since 2×556155551² = 618617993816227202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556155557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39725390 + ... + 39725403.

It is an arithmetic number, because the mean of its divisors is an integer number (158901588).

Almost surely, 2^556155551 is an apocalyptic number.

556155551 is a deficient number, since it is larger than the sum of its proper divisors (79450801).

556155551 is an equidigital number, since it uses as much as digits as its factorization.

556155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79450800.

The product of its digits is 93750, while the sum is 38.

The square root of 556155551 is about 23582.9504303427. The cubic root of 556155551 is about 822.3665281705.

The spelling of 556155551 in words is "five hundred fifty-six million, one hundred fifty-five thousand, five hundred fifty-one".