6440265707 has 8 divisors (see below), whose sum is σ = 6846350160. Its totient is φ = 6040893600.

The previous prime is 6440265661. The next prime is 6440265791. The reversal of 6440265707 is 7075620446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6440265707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440265107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676108 + ... + 1679945.

It is an arithmetic number, because the mean of its divisors is an integer number (855793770).

Almost surely, 2^6440265707 is an apocalyptic number.

6440265707 is a deficient number, since it is larger than the sum of its proper divisors (406084453).

6440265707 is a wasteful number, since it uses less digits than its factorization.

6440265707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356173.

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 6440265707 is about 80251.2660772402. The cubic root of 6440265707 is about 1860.5210806402.

The spelling of 6440265707 in words is "six billion, four hundred forty million, two hundred sixty-five thousand, seven hundred seven".