6639701 has 4 divisors (see below), whose sum is σ = 6657600. Its totient is φ = 6621804.

The previous prime is 6639697. The next prime is 6639719. The reversal of 6639701 is 1079366.

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 6639701 - 2² = 6639697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8381 + ... + 9138.

It is an arithmetic number, because the mean of its divisors is an integer number (1664400).

Almost surely, 2^6639701 is an apocalyptic number.

It is an amenable number.

6639701 is a deficient number, since it is larger than the sum of its proper divisors (17899).

6639701 is a wasteful number, since it uses less digits than its factorization.

6639701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17898.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 6639701 is about 2576.7617274401. The cubic root of 6639701 is about 187.9531062307.

The spelling of 6639701 in words is "six million, six hundred thirty-nine thousand, seven hundred one".