6440791895 has 4 divisors (see below), whose sum is σ = 7728950280. Its totient is φ = 5152633512.

The previous prime is 6440791883. The next prime is 6440791997. The reversal of 6440791895 is 5981970446.

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 6440791895 - 2⁶ = 6440791831 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644079185 + ... + 644079194.

It is an arithmetic number, because the mean of its divisors is an integer number (1932237570).

Almost surely, 2^6440791895 is an apocalyptic number.

6440791895 is a deficient number, since it is larger than the sum of its proper divisors (1288158385).

6440791895 is a wasteful number, since it uses less digits than its factorization.

6440791895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288158384.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 6440791895 is about 80254.5443884644. The cubic root of 6440791895 is about 1860.5717492125.

The spelling of 6440791895 in words is "six billion, four hundred forty million, seven hundred ninety-one thousand, eight hundred ninety-five".