6638125791 has 8 divisors (see below), whose sum is σ = 9655455744. Its totient is φ = 4023106520.

The previous prime is 6638125783. The next prime is 6638125807. The reversal of 6638125791 is 1975218366.

6638125791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6638125791 - 2³ = 6638125783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6638125791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638125721) 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 7 ways as a sum of consecutive naturals, for example, 100577631 + ... + 100577696.

It is an arithmetic number, because the mean of its divisors is an integer number (1206931968).

Almost surely, 2^6638125791 is an apocalyptic number.

6638125791 is a deficient number, since it is larger than the sum of its proper divisors (3017329953).

6638125791 is a wasteful number, since it uses less digits than its factorization.

6638125791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201155341.

The product of its digits is 544320, while the sum is 48.

The square root of 6638125791 is about 81474.6941755537. The cubic root of 6638125791 is about 1879.3824166372.

The spelling of 6638125791 in words is "six billion, six hundred thirty-eight million, one hundred twenty-five thousand, seven hundred ninety-one".