266198121795872 has 144 divisors (see below), whose sum is σ = 667761191629560. Its totient is φ = 103671479181312.

The previous prime is 266198121795829. The next prime is 266198121795911. The reversal of 266198121795872 is 278597121891662.

It can be written as a sum of positive squares in 4 ways, for example, as 263040520738576 + 3157601057296 = 16218524^2 + 1776964^2 .

It is a super-2 number, since 2×266198121795872² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266198121795872.

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, 171406703 + ... + 172952750.

Almost surely, 2^{266198121795872} is an apocalyptic number.

It is an amenable number.

266198121795872 is an abundant number, since it is smaller than the sum of its proper divisors (401563069833688).

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

266198121795872 is a wasteful number, since it uses less digits than its factorization.

266198121795872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344359523 (or 344359508 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 74.

The spelling of 266198121795872 in words is "two hundred sixty-six trillion, one hundred ninety-eight billion, one hundred twenty-one million, seven hundred ninety-five thousand, eight hundred seventy-two".