265863779238125 has 10 divisors (see below), whose sum is σ = 332223378536742. Its totient is φ = 212691023390000.

The previous prime is 265863779238107. The next prime is 265863779238143. The reversal of 265863779238125 is 521832977368562.

It is an interprime number because it is at equal distance from previous prime (265863779238107) and next prime (265863779238143).

It can be written as a sum of positive squares in 5 ways, for example, as 119811019255684 + 146052759982441 = 10945822^2 + 12085229^2 .

It is not a de Polignac number, because 265863779238125 - 2¹⁰ = 265863779237101 is a prime.

It is a super-2 number, since 2×265863779238125² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 212691022766 + ... + 212691024015.

Almost surely, 2^{265863779238125} is an apocalyptic number.

265863779238125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

265863779238125 is a deficient number, since it is larger than the sum of its proper divisors (66359599298617).

265863779238125 is an frugal number, since it uses more digits than its factorization.

265863779238125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425382046801 (or 425382046786 counting only the distinct ones).

The product of its digits is 1828915200, while the sum is 74.

The spelling of 265863779238125 in words is "two hundred sixty-five trillion, eight hundred sixty-three billion, seven hundred seventy-nine million, two hundred thirty-eight thousand, one hundred twenty-five".