6446143787 has 4 divisors (see below), whose sum is σ = 6446520456. Its totient is φ = 6445767120.

The previous prime is 6446143771. The next prime is 6446143799. The reversal of 6446143787 is 7873416446.

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 6446143787 - 2⁴ = 6446143771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6446143757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161378 + ... + 197319.

It is an arithmetic number, because the mean of its divisors is an integer number (1611630114).

Almost surely, 2^6446143787 is an apocalyptic number.

6446143787 is a deficient number, since it is larger than the sum of its proper divisors (376669).

6446143787 is a wasteful number, since it uses less digits than its factorization.

6446143787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376668.

The product of its digits is 2709504, while the sum is 50.

The square root of 6446143787 is about 80287.8806981477. The cubic root of 6446143787 is about 1861.0869458144.

The spelling of 6446143787 in words is "six billion, four hundred forty-six million, one hundred forty-three thousand, seven hundred eighty-seven".