6442936443391 has 4 divisors (see below), whose sum is σ = 7363355935312. Its totient is φ = 5522516951472.

The previous prime is 6442936443379. The next prime is 6442936443407. The reversal of 6442936443391 is 1933446392446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6442936443391 - 2⁹ = 6442936442879 is a prime.

It is a super-2 number, since 2×6442936443391² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442936413391) 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, 460209745950 + ... + 460209745963.

It is an arithmetic number, because the mean of its divisors is an integer number (1840838983828).

Almost surely, 2^{6442936443391} is an apocalyptic number.

6442936443391 is a deficient number, since it is larger than the sum of its proper divisors (920419491921).

6442936443391 is an equidigital number, since it uses as much as digits as its factorization.

6442936443391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920419491920.

The product of its digits is 40310784, while the sum is 58.

The spelling of 6442936443391 in words is "six trillion, four hundred forty-two billion, nine hundred thirty-six million, four hundred forty-three thousand, three hundred ninety-one".