491768258357 has 4 divisors (see below), whose sum is σ = 496637251116. Its totient is φ = 486899265600.

The previous prime is 491768258279. The next prime is 491768258419. The reversal of 491768258357 is 753852867194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 464843058436 + 26925199921 = 681794^2 + 164089^2 .

It is a cyclic number.

It is not a de Polignac number, because 491768258357 - 2²⁸ = 491499822901 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491768258293 and 491768258302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491768258057) 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, 2434496228 + ... + 2434496429.

It is an arithmetic number, because the mean of its divisors is an integer number (124159312779).

Almost surely, 2^491768258357 is an apocalyptic number.

It is an amenable number.

491768258357 is a deficient number, since it is larger than the sum of its proper divisors (4868992759).

491768258357 is a wasteful number, since it uses less digits than its factorization.

491768258357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4868992758.

The product of its digits is 101606400, while the sum is 65.

The spelling of 491768258357 in words is "four hundred ninety-one billion, seven hundred sixty-eight million, two hundred fifty-eight thousand, three hundred fifty-seven".