6393391664 has 20 divisors (see below), whose sum is σ = 13513305480. Its totient is φ = 2906087040.

The previous prime is 6393391663. The next prime is 6393391679. The reversal of 6393391664 is 4661933936.

It is not an unprimeable number, because it can be changed into a prime (6393391663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18162869 + ... + 18163220.

It is an arithmetic number, because the mean of its divisors is an integer number (675665274).

Almost surely, 2^6393391664 is an apocalyptic number.

It is an amenable number.

6393391664 is an abundant number, since it is smaller than the sum of its proper divisors (7119913816).

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

6393391664 is a wasteful number, since it uses less digits than its factorization.

6393391664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36326108 (or 36326102 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 50.

The square root of 6393391664 is about 79958.6872328454. The cubic root of 6393391664 is about 1855.9962888228.

The spelling of 6393391664 in words is "six billion, three hundred ninety-three million, three hundred ninety-one thousand, six hundred sixty-four".