263112661 has 16 divisors (see below), whose sum is σ = 309605760. Its totient is φ = 218877120.

The previous prime is 263112649. The next prime is 263112667. The reversal of 263112661 is 166211362.

It is a de Polignac number, because none of the positive numbers 2^k-263112661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263112667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126135 + ... + 128203.

It is an arithmetic number, because the mean of its divisors is an integer number (19350360).

Almost surely, 2^263112661 is an apocalyptic number.

It is an amenable number.

263112661 is a deficient number, since it is larger than the sum of its proper divisors (46493099).

263112661 is a wasteful number, since it uses less digits than its factorization.

263112661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604.

The product of its digits is 2592, while the sum is 28.

The square root of 263112661 is about 16220.7478557556. The cubic root of 263112661 is about 640.7873293684.

The spelling of 263112661 in words is "two hundred sixty-three million, one hundred twelve thousand, six hundred sixty-one".