266256138 has 32 divisors (see below), whose sum is σ = 541442880. Its totient is φ = 87274880.

The previous prime is 266256127. The next prime is 266256167. The reversal of 266256138 is 831652662.

It is a junction number, because it is equal to n+sod(n) for n = 266256096 and 266256105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103933 + ... + 106463.

It is an arithmetic number, because the mean of its divisors is an integer number (16920090).

Almost surely, 2^266256138 is an apocalyptic number.

266256138 is an abundant number, since it is smaller than the sum of its proper divisors (275186742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266256138 is a wasteful number, since it uses less digits than its factorization.

266256138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its digits is 103680, while the sum is 39.

The square root of 266256138 is about 16317.3569550954. The cubic root of 266256138 is about 643.3291192030.

The spelling of 266256138 in words is "two hundred sixty-six million, two hundred fifty-six thousand, one hundred thirty-eight".