68644571263 has 4 divisors (see below), whose sum is σ = 68645095288. Its totient is φ = 68644047240.

The previous prime is 68644571239. The next prime is 68644571267. The reversal of 68644571263 is 36217544686.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68644571263 - 2²⁹ = 68107700351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68644571263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68644571267) 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, 127420 + ... + 391822.

It is an arithmetic number, because the mean of its divisors is an integer number (17161273822).

Almost surely, 2^68644571263 is an apocalyptic number.

68644571263 is a deficient number, since it is larger than the sum of its proper divisors (524025).

68644571263 is a wasteful number, since it uses less digits than its factorization.

68644571263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524024.

The product of its digits is 5806080, while the sum is 52.

The spelling of 68644571263 in words is "sixty-eight billion, six hundred forty-four million, five hundred seventy-one thousand, two hundred sixty-three".