6399958351 has 4 divisors (see below), whose sum is σ = 6620646600. Its totient is φ = 6179270104.

The previous prime is 6399958321. The next prime is 6399958361. The reversal of 6399958351 is 1538599936.

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 6399958351 - 2¹⁷ = 6399827279 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 (6399958321) 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, 110344081 + ... + 110344138.

It is an arithmetic number, because the mean of its divisors is an integer number (1655161650).

Almost surely, 2^6399958351 is an apocalyptic number.

6399958351 is a deficient number, since it is larger than the sum of its proper divisors (220688249).

6399958351 is a wasteful number, since it uses less digits than its factorization.

6399958351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220688248.

The product of its digits is 7873200, while the sum is 58.

The square root of 6399958351 is about 79999.7396933265. The cubic root of 6399958351 is about 1856.6315059878.

The spelling of 6399958351 in words is "six billion, three hundred ninety-nine million, nine hundred fifty-eight thousand, three hundred fifty-one".