265863993 has 16 divisors (see below), whose sum is σ = 359719680. Its totient is φ = 174635136.

The previous prime is 265863977. The next prime is 265864013. The reversal of 265863993 is 399368562.

It is not a de Polignac number, because 265863993 - 2⁴ = 265863977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265863293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159621 + ... + 161277.

It is an arithmetic number, because the mean of its divisors is an integer number (22482480).

Almost surely, 2^265863993 is an apocalyptic number.

It is an amenable number.

265863993 is a deficient number, since it is larger than the sum of its proper divisors (93855687).

265863993 is a wasteful number, since it uses less digits than its factorization.

265863993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416.

The product of its digits is 2099520, while the sum is 51.

The square root of 265863993 is about 16305.3363350775. The cubic root of 265863993 is about 643.0131299285.

The spelling of 265863993 in words is "two hundred sixty-five million, eight hundred sixty-three thousand, nine hundred ninety-three".