556644484446655 has 64 divisors (see below), whose sum is σ = 748980367148160. Its totient is φ = 396983264071680.

The previous prime is 556644484446653. The next prime is 556644484446689.

It is a happy number.

556644484446655 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 556644484446655 - 2¹ = 556644484446653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556644484446653) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 665860909 + ... + 666696361.

It is an arithmetic number, because the mean of its divisors is an integer number (11702818236690).

Almost surely, 2^{556644484446655} is an apocalyptic number.

556644484446655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

556644484446655 is a deficient number, since it is larger than the sum of its proper divisors (192335882701505).

556644484446655 is a wasteful number, since it uses less digits than its factorization.

556644484446655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837433 (or 837411 counting only the distinct ones).

The product of its digits is 26542080000, while the sum is 76.

The spelling of 556644484446655 in words is "five hundred fifty-six trillion, six hundred forty-four billion, four hundred eighty-four million, four hundred forty-six thousand, six hundred fifty-five".