6400725999 has 16 divisors (see below), whose sum is σ = 8735265792. Its totient is φ = 4166725248.

The previous prime is 6400725977. The next prime is 6400726019. The reversal of 6400725999 is 9995270046.

6400725999 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6400725999 - 2⁵ = 6400725967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400725599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 817447 + ... + 825239.

It is an arithmetic number, because the mean of its divisors is an integer number (545954112).

Almost surely, 2^6400725999 is an apocalyptic number.

6400725999 is a deficient number, since it is larger than the sum of its proper divisors (2334539793).

6400725999 is a wasteful number, since it uses less digits than its factorization.

6400725999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14206.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The square root of 6400725999 is about 80004.5373650770. The cubic root of 6400725999 is about 1856.7057347251.

The spelling of 6400725999 in words is "six billion, four hundred million, seven hundred twenty-five thousand, nine hundred ninety-nine".