6639157 has 24 divisors (see below), whose sum is σ = 8306496. Its totient is φ = 5277888.

The previous prime is 6639119. The next prime is 6639209. The reversal of 6639157 is 7519366.

6639157 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6639157 - 2¹¹ = 6637109 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

Its product of digits (34020) is a multiple of the sum of its prime divisors (210).

6639157 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48393 + ... + 48529.

It is an arithmetic number, because the mean of its divisors is an integer number (346104).

Almost surely, 2^6639157 is an apocalyptic number.

It is an amenable number.

6639157 is a deficient number, since it is larger than the sum of its proper divisors (1667339).

6639157 is a wasteful number, since it uses less digits than its factorization.

6639157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 210 counting only the distinct ones).

The product of its digits is 34020, while the sum is 37.

The square root of 6639157 is about 2576.6561664297. The cubic root of 6639157 is about 187.9479730034.

The spelling of 6639157 in words is "six million, six hundred thirty-nine thousand, one hundred fifty-seven".