6399945530 has 16 divisors (see below), whose sum is σ = 12567165984. Its totient is φ = 2327252880.

The previous prime is 6399945529. The next prime is 6399945557. The reversal of 6399945530 is 355499936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29090552 + ... + 29090771.

It is an arithmetic number, because the mean of its divisors is an integer number (785447874).

Almost surely, 2^6399945530 is an apocalyptic number.

6399945530 is a deficient number, since it is larger than the sum of its proper divisors (6167220454).

6399945530 is a wasteful number, since it uses less digits than its factorization.

6399945530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58181341.

The product of its (nonzero) digits is 3936600, while the sum is 53.

The square root of 6399945530 is about 79999.6595617756. The cubic root of 6399945530 is about 1856.6302661938.

The spelling of 6399945530 in words is "six billion, three hundred ninety-nine million, nine hundred forty-five thousand, five hundred thirty".