491886268399 has 4 divisors (see below), whose sum is σ = 492041784136. Its totient is φ = 491730752664.

The previous prime is 491886268397. The next prime is 491886268463. The reversal of 491886268399 is 993862688194.

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 491886268399 - 2¹ = 491886268397 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 (491886268397) 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, 77753124 + ... + 77759449.

It is an arithmetic number, because the mean of its divisors is an integer number (123010446034).

Almost surely, 2^491886268399 is an apocalyptic number.

491886268399 is a deficient number, since it is larger than the sum of its proper divisors (155515737).

491886268399 is a wasteful number, since it uses less digits than its factorization.

491886268399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155515736.

The product of its digits is 322486272, while the sum is 73.

The spelling of 491886268399 in words is "four hundred ninety-one billion, eight hundred eighty-six million, two hundred sixty-eight thousand, three hundred ninety-nine".