266139066 has 8 divisors (see below), whose sum is σ = 532278144. Its totient is φ = 88713020.

The previous prime is 266139059. The next prime is 266139079. The reversal of 266139066 is 660931662.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

266139066 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22178250 + ... + 22178261.

It is an arithmetic number, because the mean of its divisors is an integer number (66534768).

Almost surely, 2^266139066 is an apocalyptic number.

266139066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

266139066 is a wasteful number, since it uses less digits than its factorization.

266139066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44356516.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 266139066 is about 16313.7692149914. The cubic root of 266139066 is about 643.2348154390.

The spelling of 266139066 in words is "two hundred sixty-six million, one hundred thirty-nine thousand, sixty-six".