64891863304423 has 4 divisors (see below), whose sum is σ = 64891883266920. Its totient is φ = 64891843341928.

The previous prime is 64891863304381. The next prime is 64891863304447. The reversal of 64891863304423 is 32440336819846.

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 64891863304423 - 2²⁵ = 64891829749991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64891863307423) 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, 3849640 + ... + 12025117.

It is an arithmetic number, because the mean of its divisors is an integer number (16222970816730).

Almost surely, 2^{64891863304423} is an apocalyptic number.

64891863304423 is a deficient number, since it is larger than the sum of its proper divisors (19962497).

64891863304423 is a wasteful number, since it uses less digits than its factorization.

64891863304423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19962496.

The product of its (nonzero) digits is 71663616, while the sum is 61.

The spelling of 64891863304423 in words is "sixty-four trillion, eight hundred ninety-one billion, eight hundred sixty-three million, three hundred four thousand, four hundred twenty-three".