6400195819 has 8 divisors (see below), whose sum is σ = 6858326160. Its totient is φ = 5951137536.

The previous prime is 6400195811. The next prime is 6400195829. The reversal of 6400195819 is 9185910046.

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 6400195819 - 2³ = 6400195811 is a prime.

It is a super-2 number, since 2×6400195819² = 81925013043090161522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400195811) 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 7 ways as a sum of consecutive naturals, for example, 2266554 + ... + 2269375.

It is an arithmetic number, because the mean of its divisors is an integer number (857290770).

Almost surely, 2^6400195819 is an apocalyptic number.

6400195819 is a deficient number, since it is larger than the sum of its proper divisors (458130341).

6400195819 is a wasteful number, since it uses less digits than its factorization.

6400195819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536029.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 6400195819 is about 80001.2238593886. The cubic root of 6400195819 is about 1856.6544689037.

The spelling of 6400195819 in words is "six billion, four hundred million, one hundred ninety-five thousand, eight hundred nineteen".