263825491861 has 4 divisors (see below), whose sum is σ = 264684858592. Its totient is φ = 262966125132.

The previous prime is 263825491859. The next prime is 263825491871. The reversal of 263825491861 is 168194528362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 263825491861 - 2¹ = 263825491859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263825491871) 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, 429682905 + ... + 429683518.

It is an arithmetic number, because the mean of its divisors is an integer number (66171214648).

Almost surely, 2^263825491861 is an apocalyptic number.

It is an amenable number.

263825491861 is a deficient number, since it is larger than the sum of its proper divisors (859366731).

263825491861 is an equidigital number, since it uses as much as digits as its factorization.

263825491861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859366730.

The product of its digits is 4976640, while the sum is 55.

The spelling of 263825491861 in words is "two hundred sixty-three billion, eight hundred twenty-five million, four hundred ninety-one thousand, eight hundred sixty-one".