64891904248313 has 4 divisors (see below), whose sum is σ = 67713291389568. Its totient is φ = 62070517107060.

The previous prime is 64891904248309. The next prime is 64891904248319. The reversal of 64891904248313 is 31384240919846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64891904248313 - 2² = 64891904248309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64891904248319) 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, 1410693570593 + ... + 1410693570638.

It is an arithmetic number, because the mean of its divisors is an integer number (16928322847392).

Almost surely, 2^{64891904248313} is an apocalyptic number.

It is an amenable number.

64891904248313 is a deficient number, since it is larger than the sum of its proper divisors (2821387141255).

64891904248313 is a wasteful number, since it uses less digits than its factorization.

64891904248313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821387141254.

The product of its (nonzero) digits is 35831808, while the sum is 62.

The spelling of 64891904248313 in words is "sixty-four trillion, eight hundred ninety-one billion, nine hundred four million, two hundred forty-eight thousand, three hundred thirteen".