266820987443 has 4 divisors (see below), whose sum is σ = 274032365520. Its totient is φ = 259609609368.

The previous prime is 266820987373. The next prime is 266820987469. The reversal of 266820987443 is 344789028662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 266820987443 - 2²⁴ = 266804210227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266820987143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605688983 + ... + 3605689056.

It is an arithmetic number, because the mean of its divisors is an integer number (68508091380).

Almost surely, 2^266820987443 is an apocalyptic number.

266820987443 is a deficient number, since it is larger than the sum of its proper divisors (7211378077).

266820987443 is an equidigital number, since it uses as much as digits as its factorization.

266820987443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7211378076.

The product of its (nonzero) digits is 27869184, while the sum is 59.

The spelling of 266820987443 in words is "two hundred sixty-six billion, eight hundred twenty million, nine hundred eighty-seven thousand, four hundred forty-three".