266855138 has 16 divisors (see below), whose sum is σ = 436938624. Its totient is φ = 121223760.

The previous prime is 266855107. The next prime is 266855189. The reversal of 266855138 is 831558662.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51356 + ... + 56312.

It is an arithmetic number, because the mean of its divisors is an integer number (27308664).

Almost surely, 2^266855138 is an apocalyptic number.

266855138 is a deficient number, since it is larger than the sum of its proper divisors (170083486).

266855138 is a wasteful number, since it uses less digits than its factorization.

266855138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417.

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

The square root of 266855138 is about 16335.7013317458. The cubic root of 266855138 is about 643.8111932529.

The spelling of 266855138 in words is "two hundred sixty-six million, eight hundred fifty-five thousand, one hundred thirty-eight".