263561963 has 8 divisors (see below), whose sum is σ = 302178528. Its totient is φ = 225186624.

The previous prime is 263561959. The next prime is 263561993. The reversal of 263561963 is 369165362.

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 263561963 - 2² = 263561959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263561963.

It is not an unprimeable number, because it can be changed into a prime (263561923) 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, 57956 + ... + 62337.

It is an arithmetic number, because the mean of its divisors is an integer number (37772316).

Almost surely, 2^263561963 is an apocalyptic number.

263561963 is a deficient number, since it is larger than the sum of its proper divisors (38616565).

263561963 is a wasteful number, since it uses less digits than its factorization.

263561963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120613.

The product of its digits is 174960, while the sum is 41.

The square root of 263561963 is about 16234.5915563035. The cubic root of 263561963 is about 641.1518668790.

The spelling of 263561963 in words is "two hundred sixty-three million, five hundred sixty-one thousand, nine hundred sixty-three".