556403505304655 has 8 divisors (see below), whose sum is σ = 667768181285184. Its totient is φ = 445066820964000.

The previous prime is 556403505304553. The next prime is 556403505304657.

556403505304655 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 556403505304655 - 2²⁰ = 556403504256079 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 556403505304655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556403505304657) 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, 6997866236 + ... + 6997945745.

It is an arithmetic number, because the mean of its divisors is an integer number (83471022660648).

Almost surely, 2^{556403505304655} is an apocalyptic number.

556403505304655 is a deficient number, since it is larger than the sum of its proper divisors (111364675980529).

556403505304655 is a wasteful number, since it uses less digits than its factorization.

556403505304655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13995819937.

The product of its (nonzero) digits is 81000000, while the sum is 56.

Subtracting from 556403505304655 its product of nonzero digits (81000000), we obtain a palindrome (556403424304655).

The spelling of 556403505304655 in words is "five hundred fifty-six trillion, four hundred three billion, five hundred five million, three hundred four thousand, six hundred fifty-five".