6440306404253 has 4 divisors (see below), whose sum is σ = 6500496183840. Its totient is φ = 6380116624668.

The previous prime is 6440306404199. The next prime is 6440306404331. The reversal of 6440306404253 is 3524046030446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6440306404253 - 2³⁴ = 6423126535069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440306404253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440306404153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30094889633 + ... + 30094889846.

It is an arithmetic number, because the mean of its divisors is an integer number (1625124045960).

Almost surely, 2^{6440306404253} is an apocalyptic number.

It is an amenable number.

6440306404253 is a deficient number, since it is larger than the sum of its proper divisors (60189779587).

6440306404253 is a wasteful number, since it uses less digits than its factorization.

6440306404253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60189779586.

The product of its (nonzero) digits is 829440, while the sum is 41.

The spelling of 6440306404253 in words is "six trillion, four hundred forty billion, three hundred six million, four hundred four thousand, two hundred fifty-three".