266138825 has 24 divisors (see below), whose sum is σ = 357575328. Its totient is φ = 195713280.

The previous prime is 266138797. The next prime is 266138837. The reversal of 266138825 is 528831662.

It is not a de Polignac number, because 266138825 - 2²² = 261944521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10994 + ... + 25556.

It is an arithmetic number, because the mean of its divisors is an integer number (14898972).

Almost surely, 2^266138825 is an apocalyptic number.

266138825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

266138825 is a deficient number, since it is larger than the sum of its proper divisors (91436503).

266138825 is a wasteful number, since it uses less digits than its factorization.

266138825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14633 (or 14628 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 266138825 is about 16313.7618285912. The cubic root of 266138825 is about 643.2346212803.

The spelling of 266138825 in words is "two hundred sixty-six million, one hundred thirty-eight thousand, eight hundred twenty-five".