6400259791 has 8 divisors (see below), whose sum is σ = 6420502800. Its totient is φ = 6380035200.

The previous prime is 6400259753. The next prime is 6400259819. The reversal of 6400259791 is 1979520046.

It is a happy number.

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 6400259791 - 2⁹ = 6400259279 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 (6400059791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1058565 + ... + 1064593.

It is an arithmetic number, because the mean of its divisors is an integer number (802562850).

Almost surely, 2^6400259791 is an apocalyptic number.

6400259791 is a deficient number, since it is larger than the sum of its proper divisors (20243009).

6400259791 is a wasteful number, since it uses less digits than its factorization.

6400259791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9209.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 6400259791 is about 80001.6236772730. The cubic root of 6400259791 is about 1856.6606548345.

The spelling of 6400259791 in words is "six billion, four hundred million, two hundred fifty-nine thousand, seven hundred ninety-one".