263420155 has 4 divisors (see below), whose sum is σ = 316104192. Its totient is φ = 210736120.

The previous prime is 263420149. The next prime is 263420167. The reversal of 263420155 is 551024362.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 263420155 - 2³ = 263420147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26342011 + ... + 26342020.

It is an arithmetic number, because the mean of its divisors is an integer number (79026048).

Almost surely, 2^263420155 is an apocalyptic number.

263420155 is a deficient number, since it is larger than the sum of its proper divisors (52684037).

263420155 is an equidigital number, since it uses as much as digits as its factorization.

263420155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52684036.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 263420155 is about 16230.2235043144. The cubic root of 263420155 is about 641.0368568902.

The spelling of 263420155 in words is "two hundred sixty-three million, four hundred twenty thousand, one hundred fifty-five".