6400634865 has 8 divisors (see below), whose sum is σ = 10241015808. Its totient is φ = 3413671920.

The previous prime is 6400634843. The next prime is 6400634939. The reversal of 6400634865 is 5684360046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6400634865 - 2¹¹ = 6400632817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213354481 + ... + 213354510.

It is an arithmetic number, because the mean of its divisors is an integer number (1280126976).

Almost surely, 2^6400634865 is an apocalyptic number.

It is an amenable number.

6400634865 is a deficient number, since it is larger than the sum of its proper divisors (3840380943).

6400634865 is a wasteful number, since it uses less digits than its factorization.

6400634865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426708999.

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 6400634865 is about 80003.9678078531. The cubic root of 6400634865 is about 1856.6969227131.

The spelling of 6400634865 in words is "six billion, four hundred million, six hundred thirty-four thousand, eight hundred sixty-five".