6399945522 has 24 divisors (see below), whose sum is σ = 14596367760. Its totient is φ = 2021035320.

The previous prime is 6399945521. The next prime is 6399945529. The reversal of 6399945522 is 2255499936.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6399945521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9356304 + ... + 9356987.

It is an arithmetic number, because the mean of its divisors is an integer number (608181990).

Almost surely, 2^6399945522 is an apocalyptic number.

6399945522 is an abundant number, since it is smaller than the sum of its proper divisors (8196422238).

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

6399945522 is a wasteful number, since it uses less digits than its factorization.

6399945522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18713318 (or 18713315 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The square root of 6399945522 is about 79999.6595117754. The cubic root of 6399945522 is about 1856.6302654202.

The spelling of 6399945522 in words is "six billion, three hundred ninety-nine million, nine hundred forty-five thousand, five hundred twenty-two".