556977779655 has 16 divisors (see below), whose sum is σ = 972179397504. Its totient is φ = 270049832480.

The previous prime is 556977779627. The next prime is 556977779671.

556977779655 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 556977779655 - 2¹⁴ = 556977763271 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1687811289 + ... + 1687811618.

It is an arithmetic number, because the mean of its divisors is an integer number (60761212344).

Almost surely, 2^556977779655 is an apocalyptic number.

556977779655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

556977779655 is a deficient number, since it is larger than the sum of its proper divisors (415201617849).

556977779655 is a wasteful number, since it uses less digits than its factorization.

556977779655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375622926.

The product of its digits is 4375822500, while the sum is 78.

The spelling of 556977779655 in words is "five hundred fifty-six billion, nine hundred seventy-seven million, seven hundred seventy-nine thousand, six hundred fifty-five".