6640169399 has 8 divisors (see below), whose sum is σ = 6653251440. Its totient is φ = 6627102336.

The previous prime is 6640169387. The next prime is 6640169401. The reversal of 6640169399 is 9939610466.

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 6640169399 - 2³² = 2345202103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6640169399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640169329) 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, 1266287 + ... + 1271519.

It is an arithmetic number, because the mean of its divisors is an integer number (831656430).

Almost surely, 2^6640169399 is an apocalyptic number.

6640169399 is a deficient number, since it is larger than the sum of its proper divisors (13082041).

6640169399 is a wasteful number, since it uses less digits than its factorization.

6640169399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7489.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 6640169399 is about 81487.2345769569. The cubic root of 6640169399 is about 1879.5752585626.

The spelling of 6640169399 in words is "six billion, six hundred forty million, one hundred sixty-nine thousand, three hundred ninety-nine".