605717861491 has 4 divisors (see below), whose sum is σ = 606202825000. Its totient is φ = 605232897984.

The previous prime is 605717861477. The next prime is 605717861533. The reversal of 605717861491 is 194168717506.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194168717506 = 2 ⋅97084358753.

It is a cyclic number.

It is not a de Polignac number, because 605717861491 - 2¹¹ = 605717859443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (605717861471) 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, 242479881 + ... + 242482378.

It is an arithmetic number, because the mean of its divisors is an integer number (151550706250).

Almost surely, 2^605717861491 is an apocalyptic number.

605717861491 is a deficient number, since it is larger than the sum of its proper divisors (484963509).

605717861491 is a wasteful number, since it uses less digits than its factorization.

605717861491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484963508.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 605717861491 in words is "six hundred five billion, seven hundred seventeen million, eight hundred sixty-one thousand, four hundred ninety-one".