491284867653 has 16 divisors (see below), whose sum is σ = 736598466240. Its totient is φ = 323577180432.

The previous prime is 491284867649. The next prime is 491284867699. The reversal of 491284867653 is 356768482194.

491284867653 is a `hidden beast` number, since 4 + 91 + 2 + 8 + 486 + 7 + 65 + 3 = 666.

It is not a de Polignac number, because 491284867653 - 2² = 491284867649 is a prime.

It is a super-4 number, since 4×491284867653⁴ (a number of 48 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491284867753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109610626 + ... + 109615107.

It is an arithmetic number, because the mean of its divisors is an integer number (46037404140).

Almost surely, 2^491284867653 is an apocalyptic number.

It is an amenable number.

491284867653 is a deficient number, since it is larger than the sum of its proper divisors (245313598587).

491284867653 is a wasteful number, since it uses less digits than its factorization.

491284867653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219225825 (or 219225819 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 491284867653 in words is "four hundred ninety-one billion, two hundred eighty-four million, eight hundred sixty-seven thousand, six hundred fifty-three".