491865243355 has 16 divisors (see below), whose sum is σ = 590825410560. Its totient is φ = 393100989408.

The previous prime is 491865243341. The next prime is 491865243367. The reversal of 491865243355 is 553342568194.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491865243355 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491865243296 and 491865243305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22804066 + ... + 22825624.

It is an arithmetic number, because the mean of its divisors is an integer number (36926588160).

Almost surely, 2^491865243355 is an apocalyptic number.

491865243355 is a deficient number, since it is larger than the sum of its proper divisors (98960167205).

491865243355 is a wasteful number, since it uses less digits than its factorization.

491865243355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25890.

The product of its digits is 15552000, while the sum is 55.

The spelling of 491865243355 in words is "four hundred ninety-one billion, eight hundred sixty-five million, two hundred forty-three thousand, three hundred fifty-five".