263650985 has 16 divisors (see below), whose sum is σ = 342748560. Its totient is φ = 194688000.

The previous prime is 263650979. The next prime is 263650987. The reversal of 263650985 is 589056362.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 223442704 + 40208281 = 14948^2 + 6341^2 .

It is not a de Polignac number, because 263650985 - 2⁴ = 263650969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263650987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1016 + ... + 22985.

It is an arithmetic number, because the mean of its divisors is an integer number (21421785).

Almost surely, 2^263650985 is an apocalyptic number.

It is an amenable number.

263650985 is a deficient number, since it is larger than the sum of its proper divisors (79097575).

263650985 is an equidigital number, since it uses as much as digits as its factorization.

263650985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24045 (or 24019 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 263650985 is about 16237.3330630372. Note that the first 3 decimals coincide. The cubic root of 263650985 is about 641.2240449681.

The spelling of 263650985 in words is "two hundred sixty-three million, six hundred fifty thousand, nine hundred eighty-five".