6439317588491 has 4 divisors (see below), whose sum is σ = 6481962075984. Its totient is φ = 6396673101000.

The previous prime is 6439317588433. The next prime is 6439317588493. The reversal of 6439317588491 is 1948857139346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6439317588491 is a prime.

It is a super-2 number, since 2×6439317588491² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6439317588493) 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, 21322243520 + ... + 21322243821.

It is an arithmetic number, because the mean of its divisors is an integer number (1620490518996).

Almost surely, 2^{6439317588491} is an apocalyptic number.

6439317588491 is a deficient number, since it is larger than the sum of its proper divisors (42644487493).

6439317588491 is a wasteful number, since it uses less digits than its factorization.

6439317588491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42644487492.

The product of its digits is 156764160, while the sum is 68.

The spelling of 6439317588491 in words is "six trillion, four hundred thirty-nine billion, three hundred seventeen million, five hundred eighty-eight thousand, four hundred ninety-one".