263188545987361 has 8 divisors (see below), whose sum is σ = 263560714525800. Its totient is φ = 262816380147840.

The previous prime is 263188545987331. The next prime is 263188545987379. The reversal of 263188545987361 is 163789545881362.

It can be written as a sum of positive squares in 4 ways, for example, as 2571433537761 + 260617112449600 = 1603569^2 + 16143640^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 263188545987361 - 2²⁹ = 263188009116449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263188545987331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272688171 + ... + 273651631.

It is an arithmetic number, because the mean of its divisors is an integer number (32945089315725).

Almost surely, 2^{263188545987361} is an apocalyptic number.

It is an amenable number.

263188545987361 is a deficient number, since it is larger than the sum of its proper divisors (372168538439).

263188545987361 is an equidigital number, since it uses as much as digits as its factorization.

263188545987361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349459.

The product of its digits is 2090188800, while the sum is 76.

The spelling of 263188545987361 in words is "two hundred sixty-three trillion, one hundred eighty-eight billion, five hundred forty-five million, nine hundred eighty-seven thousand, three hundred sixty-one".