263036420643 has 4 divisors (see below), whose sum is σ = 350715227528. Its totient is φ = 175357613760.

The previous prime is 263036420627. The next prime is 263036420651. The reversal of 263036420643 is 346024630362.

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

It is not a de Polignac number, because 263036420643 - 2⁴ = 263036420627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263036420743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43839403438 + ... + 43839403443.

It is an arithmetic number, because the mean of its divisors is an integer number (87678806882).

Almost surely, 2^263036420643 is an apocalyptic number.

263036420643 is a deficient number, since it is larger than the sum of its proper divisors (87678806885).

263036420643 is an equidigital number, since it uses as much as digits as its factorization.

263036420643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87678806884.

The product of its (nonzero) digits is 373248, while the sum is 39.

The spelling of 263036420643 in words is "two hundred sixty-three billion, thirty-six million, four hundred twenty thousand, six hundred forty-three".