263163505555 has 4 divisors (see below), whose sum is σ = 315796206672. Its totient is φ = 210530804440.

The previous prime is 263163505547. The next prime is 263163505597. The reversal of 263163505555 is 555505361362.

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

It is not a de Polignac number, because 263163505555 - 2³ = 263163505547 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, 26316350551 + ... + 26316350560.

It is an arithmetic number, because the mean of its divisors is an integer number (78949051668).

Almost surely, 2^263163505555 is an apocalyptic number.

263163505555 is a deficient number, since it is larger than the sum of its proper divisors (52632701117).

263163505555 is an equidigital number, since it uses as much as digits as its factorization.

263163505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52632701116.

The product of its (nonzero) digits is 2025000, while the sum is 46.

The spelling of 263163505555 in words is "two hundred sixty-three billion, one hundred sixty-three million, five hundred five thousand, five hundred fifty-five".