6440143635 has 24 divisors (see below), whose sum is σ = 11648261664. Its totient is φ = 3285406080.

The previous prime is 6440143621. The next prime is 6440143657. The reversal of 6440143635 is 5363410446.

6440143635 is a `hidden beast` number, since 6 + 4 + 4 + 0 + 14 + 3 + 635 = 666.

It is not a de Polignac number, because 6440143635 - 2⁵ = 6440143603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6440143635.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3110146 + ... + 3112215.

It is an arithmetic number, because the mean of its divisors is an integer number (485344236).

Almost surely, 2^6440143635 is an apocalyptic number.

6440143635 is a deficient number, since it is larger than the sum of its proper divisors (5208118029).

6440143635 is a wasteful number, since it uses less digits than its factorization.

6440143635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6222395 (or 6222392 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 6440143635 is about 80250.5055124265. The cubic root of 6440143635 is about 1860.5093254853.

The spelling of 6440143635 in words is "six billion, four hundred forty million, one hundred forty-three thousand, six hundred thirty-five".