266242779870 has 32 divisors (see below), whose sum is σ = 659595018240. Its totient is φ = 68707813920.

The previous prime is 266242779857. The next prime is 266242779871. The reversal of 266242779870 is 78977242662.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266242779871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143140350 + ... + 143142209.

It is an arithmetic number, because the mean of its divisors is an integer number (20612344320).

Almost surely, 2^266242779870 is an apocalyptic number.

266242779870 is an abundant number, since it is smaller than the sum of its proper divisors (393352238370).

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

266242779870 is a wasteful number, since it uses less digits than its factorization.

266242779870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286282600.

The product of its (nonzero) digits is 28449792, while the sum is 60.

The spelling of 266242779870 in words is "two hundred sixty-six billion, two hundred forty-two million, seven hundred seventy-nine thousand, eight hundred seventy".