6440853653 has 8 divisors (see below), whose sum is σ = 6951291648. Its totient is φ = 5932556784.

The previous prime is 6440853637. The next prime is 6440853667. The reversal of 6440853653 is 3563580446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6440853653 - 2⁴ = 6440853637 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 (6440853613) 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, 529025 + ... + 541062.

It is an arithmetic number, because the mean of its divisors is an integer number (868911456).

Almost surely, 2^6440853653 is an apocalyptic number.

It is an amenable number.

6440853653 is a deficient number, since it is larger than the sum of its proper divisors (510437995).

6440853653 is a wasteful number, since it uses less digits than its factorization.

6440853653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070563.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The square root of 6440853653 is about 80254.9291508005. The cubic root of 6440853653 is about 1860.5776959359.

The spelling of 6440853653 in words is "six billion, four hundred forty million, eight hundred fifty-three thousand, six hundred fifty-three".