263668145 has 32 divisors (see below), whose sum is σ = 355410720. Its totient is φ = 186439680.

The previous prime is 263668133. The next prime is 263668157. The reversal of 263668145 is 541866362.

It is an interprime number because it is at equal distance from previous prime (263668133) and next prime (263668157).

It can be written as a sum of positive squares in 16 ways, for example, as 74770609 + 188897536 = 8647^2 + 13744^2 .

It is not a de Polignac number, because 263668145 - 2²⁴ = 246890929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257735 + ... + 258755.

It is an arithmetic number, because the mean of its divisors is an integer number (11106585).

Almost surely, 2^263668145 is an apocalyptic number.

It is an amenable number.

263668145 is a deficient number, since it is larger than the sum of its proper divisors (91742575).

263668145 is a wasteful number, since it uses less digits than its factorization.

263668145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205.

The product of its digits is 207360, while the sum is 41.

The square root of 263668145 is about 16237.8614663385. The cubic root of 263668145 is about 641.2379562454.

The spelling of 263668145 in words is "two hundred sixty-three million, six hundred sixty-eight thousand, one hundred forty-five".