263968691 has 8 divisors (see below), whose sum is σ = 317556480. Its totient is φ = 214350408.

The previous prime is 263968669. The next prime is 263968823. The reversal of 263968691 is 196869362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263968691 - 2²² = 259774387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263968391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992231 + ... + 992496.

It is an arithmetic number, because the mean of its divisors is an integer number (39694560).

Almost surely, 2^263968691 is an apocalyptic number.

263968691 is a deficient number, since it is larger than the sum of its proper divisors (53587789).

263968691 is a wasteful number, since it uses less digits than its factorization.

263968691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984753.

The product of its digits is 839808, while the sum is 50.

The square root of 263968691 is about 16247.1133128319. The cubic root of 263968691 is about 641.4815052258.

The spelling of 263968691 in words is "two hundred sixty-three million, nine hundred sixty-eight thousand, six hundred ninety-one".