6440306404255 has 16 divisors (see below), whose sum is σ = 7844805232704. Its totient is φ = 5074760597760.

The previous prime is 6440306404199. The next prime is 6440306404331. The reversal of 6440306404255 is 5524046030446.

It is not a de Polignac number, because 6440306404255 - 2¹³ = 6440306396063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8414364 + ... + 9147793.

It is an arithmetic number, because the mean of its divisors is an integer number (490300327044).

Almost surely, 2^{6440306404255} is an apocalyptic number.

6440306404255 is a deficient number, since it is larger than the sum of its proper divisors (1404498828449).

6440306404255 is a wasteful number, since it uses less digits than its factorization.

6440306404255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17563266.

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 6440306404255 in words is "six trillion, four hundred forty billion, three hundred six million, four hundred four thousand, two hundred fifty-five".