491335563265 has 16 divisors (see below), whose sum is σ = 599298160320. Its totient is φ = 386605437120.

The previous prime is 491335563233. The next prime is 491335563293. The reversal of 491335563265 is 562365533194.

It is not a de Polignac number, because 491335563265 - 2⁵ = 491335563233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12002362 + ... + 12043228.

It is an arithmetic number, because the mean of its divisors is an integer number (37456135020).

Almost surely, 2^491335563265 is an apocalyptic number.

It is an amenable number.

491335563265 is a deficient number, since it is larger than the sum of its proper divisors (107962597055).

491335563265 is a wasteful number, since it uses less digits than its factorization.

491335563265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80352.

The product of its digits is 8748000, while the sum is 52.

The spelling of 491335563265 in words is "four hundred ninety-one billion, three hundred thirty-five million, five hundred sixty-three thousand, two hundred sixty-five".