265815863 has 2 divisors, whose sum is σ = 265815864. Its totient is φ = 265815862.

The previous prime is 265815821. The next prime is 265815877. The reversal of 265815863 is 368518562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265815863 - 2⁶ = 265815799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265815463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132907931 + 132907932.

It is an arithmetic number, because the mean of its divisors is an integer number (132907932).

Almost surely, 2^265815863 is an apocalyptic number.

265815863 is a deficient number, since it is larger than the sum of its proper divisors (1).

265815863 is an equidigital number, since it uses as much as digits as its factorization.

265815863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The square root of 265815863 is about 16303.8603710900. The cubic root of 265815863 is about 642.9743255141.

The spelling of 265815863 in words is "two hundred sixty-five million, eight hundred fifteen thousand, eight hundred sixty-three".