6390656999 has 4 divisors (see below), whose sum is σ = 6396738600. Its totient is φ = 6384575400.

The previous prime is 6390656989. The next prime is 6390657001. The reversal of 6390656999 is 9996560936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6390656999 - 2¹⁶ = 6390591463 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 (6390656989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3039224 + ... + 3041325.

It is an arithmetic number, because the mean of its divisors is an integer number (1599184650).

Almost surely, 2^6390656999 is an apocalyptic number.

6390656999 is a deficient number, since it is larger than the sum of its proper divisors (6081601).

6390656999 is a wasteful number, since it uses less digits than its factorization.

6390656999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081600.

The product of its (nonzero) digits is 21257640, while the sum is 62.

The square root of 6390656999 is about 79941.5849167378. The cubic root of 6390656999 is about 1855.7316274252.

The spelling of 6390656999 in words is "six billion, three hundred ninety million, six hundred fifty-six thousand, nine hundred ninety-nine".