6440255416 has 24 divisors (see below), whose sum is σ = 14046986520. Its totient is φ = 2760109296.

The previous prime is 6440255399. The next prime is 6440255431. The reversal of 6440255416 is 6145520446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8214220 + ... + 8215003.

It is an arithmetic number, because the mean of its divisors is an integer number (585291105).

Almost surely, 2^6440255416 is an apocalyptic number.

It is an amenable number.

6440255416 is an abundant number, since it is smaller than the sum of its proper divisors (7606731104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440255416 is a wasteful number, since it uses less digits than its factorization.

6440255416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16429243 (or 16429232 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 6440255416 is about 80251.2019598461. The cubic root of 6440255416 is about 1860.5200896546.

The spelling of 6440255416 in words is "six billion, four hundred forty million, two hundred fifty-five thousand, four hundred sixteen".