8555844997 has 4 divisors (see below), whose sum is σ = 9778108576. Its totient is φ = 7333581420.

The previous prime is 8555844991. The next prime is 8555845021. The reversal of 8555844997 is 7994485558.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-8555844997 is a prime.

It is a super-2 number, since 2×8555844997² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8555844991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611131779 + ... + 611131792.

It is an arithmetic number, because the mean of its divisors is an integer number (2444527144).

Almost surely, 2^8555844997 is an apocalyptic number.

It is an amenable number.

8555844997 is a deficient number, since it is larger than the sum of its proper divisors (1222263579).

8555844997 is a wasteful number, since it uses less digits than its factorization.

8555844997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222263578.

The product of its digits is 72576000, while the sum is 64.

The square root of 8555844997 is about 92497.8107686879. The cubic root of 8555844997 is about 2045.2872106137.

The spelling of 8555844997 in words is "eight billion, five hundred fifty-five million, eight hundred forty-four thousand, nine hundred ninety-seven".