268354065491 has 4 divisors (see below), whose sum is σ = 271369279800. Its totient is φ = 265338851184.

The previous prime is 268354065481. The next prime is 268354065557. The reversal of 268354065491 is 194560453862.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194560453862 = 2 ⋅97280226931.

It is a cyclic number.

It is not a de Polignac number, because 268354065491 - 2¹⁰ = 268354064467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268354065461) 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, 1507607021 + ... + 1507607198.

It is an arithmetic number, because the mean of its divisors is an integer number (67842319950).

Almost surely, 2^268354065491 is an apocalyptic number.

268354065491 is a deficient number, since it is larger than the sum of its proper divisors (3015214309).

268354065491 is an equidigital number, since it uses as much as digits as its factorization.

268354065491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015214308.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 268354065491 in words is "two hundred sixty-eight billion, three hundred fifty-four million, sixty-five thousand, four hundred ninety-one".