556655566551 has 32 divisors (see below), whose sum is σ = 899627086848. Its totient is φ = 299271075840.

The previous prime is 556655566507. The next prime is 556655566583. The reversal of 556655566551 is 155665556655.

It is a happy number.

It is not a de Polignac number, because 556655566551 - 2⁹ = 556655566039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556655566151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9417226 + ... + 9476151.

It is an arithmetic number, because the mean of its divisors is an integer number (28113346464).

Almost surely, 2^556655566551 is an apocalyptic number.

556655566551 is a deficient number, since it is larger than the sum of its proper divisors (342971520297).

556655566551 is a wasteful number, since it uses less digits than its factorization.

556655566551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18893471.

The product of its digits is 101250000, while the sum is 60.

The spelling of 556655566551 in words is "five hundred fifty-six billion, six hundred fifty-five million, five hundred sixty-six thousand, five hundred fifty-one".