556665566655 has 64 divisors (see below), whose sum is σ = 999529440768. Its totient is φ = 262173749760.

The previous prime is 556665566651. The next prime is 556665566683.

556665566655 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 556665566655 - 2² = 556665566651 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556665566651) 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, 3667992 + ... + 3816738.

It is an arithmetic number, because the mean of its divisors is an integer number (15617647512).

Almost surely, 2^556665566655 is an apocalyptic number.

556665566655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

556665566655 is a deficient number, since it is larger than the sum of its proper divisors (442863874113).

556665566655 is a wasteful number, since it uses less digits than its factorization.

556665566655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149416.

The product of its digits is 729000000, while the sum is 66.

The spelling of 556665566655 in words is "five hundred fifty-six billion, six hundred sixty-five million, five hundred sixty-six thousand, six hundred fifty-five".