6444177997 has 4 divisors (see below), whose sum is σ = 6783345280. Its totient is φ = 6105010716.

The previous prime is 6444177989. The next prime is 6444178031. The reversal of 6444177997 is 7997714446.

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 6444177997 - 2³ = 6444177989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444177937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169583613 + ... + 169583650.

It is an arithmetic number, because the mean of its divisors is an integer number (1695836320).

Almost surely, 2^6444177997 is an apocalyptic number.

It is an amenable number.

6444177997 is a deficient number, since it is larger than the sum of its proper divisors (339167283).

6444177997 is a wasteful number, since it uses less digits than its factorization.

6444177997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339167282.

The product of its digits is 10668672, while the sum is 58.

The square root of 6444177997 is about 80275.6376306037. The cubic root of 6444177997 is about 1860.8977433917.

The spelling of 6444177997 in words is "six billion, four hundred forty-four million, one hundred seventy-seven thousand, nine hundred ninety-seven".