6436995887 has 12 divisors (see below), whose sum is σ = 7525573200. Its totient is φ = 5489690976.

The previous prime is 6436995871. The next prime is 6436995893. The reversal of 6436995887 is 7885996346.

It is not a de Polignac number, because 6436995887 - 2⁴ = 6436995871 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 (6436991887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320318 + ... + 339819.

It is an arithmetic number, because the mean of its divisors is an integer number (627131100).

Almost surely, 2^6436995887 is an apocalyptic number.

6436995887 is a deficient number, since it is larger than the sum of its proper divisors (1088577313).

6436995887 is a wasteful number, since it uses less digits than its factorization.

6436995887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660350 (or 660343 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 65.

The square root of 6436995887 is about 80230.8911018692. The cubic root of 6436995887 is about 1860.2061558022.

The spelling of 6436995887 in words is "six billion, four hundred thirty-six million, nine hundred ninety-five thousand, eight hundred eighty-seven".