6491351533913 has 4 divisors (see below), whose sum is σ = 6666793467300. Its totient is φ = 6315909600528.

The previous prime is 6491351533829. The next prime is 6491351533939. The reversal of 6491351533913 is 3193351531946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2223999550864 + 4267351983049 = 1491308^2 + 2065757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6491351533913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6491351533963) 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, 87720966638 + ... + 87720966711.

It is an arithmetic number, because the mean of its divisors is an integer number (1666698366825).

Almost surely, 2^{6491351533913} is an apocalyptic number.

It is an amenable number.

6491351533913 is a deficient number, since it is larger than the sum of its proper divisors (175441933387).

6491351533913 is a wasteful number, since it uses less digits than its factorization.

6491351533913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175441933386.

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

The spelling of 6491351533913 in words is "six trillion, four hundred ninety-one billion, three hundred fifty-one million, five hundred thirty-three thousand, nine hundred thirteen".