556801997129 has 4 divisors (see below), whose sum is σ = 636345139584. Its totient is φ = 477258854676.

The previous prime is 556801997119. The next prime is 556801997131. The reversal of 556801997129 is 921799108655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 556801997129 - 2²⁰ = 556800948553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556801997119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39771571217 + ... + 39771571230.

It is an arithmetic number, because the mean of its divisors is an integer number (159086284896).

Almost surely, 2^556801997129 is an apocalyptic number.

It is an amenable number.

556801997129 is a deficient number, since it is larger than the sum of its proper divisors (79543142455).

556801997129 is an equidigital number, since it uses as much as digits as its factorization.

556801997129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79543142454.

The product of its (nonzero) digits is 12247200, while the sum is 62.

The spelling of 556801997129 in words is "five hundred fifty-six billion, eight hundred one million, nine hundred ninety-seven thousand, one hundred twenty-nine".