266620118399 has 4 divisors (see below), whose sum is σ = 266876731680. Its totient is φ = 266363505120.

The previous prime is 266620118377. The next prime is 266620118407. The reversal of 266620118399 is 993811026662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993811026662 = 2 ⋅496905513331.

It is a cyclic number.

It is not a de Polignac number, because 266620118399 - 2¹⁶ = 266620052863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266620118399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266620118309) 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, 128305082 + ... + 128307159.

It is an arithmetic number, because the mean of its divisors is an integer number (66719182920).

Almost surely, 2^266620118399 is an apocalyptic number.

266620118399 is a deficient number, since it is larger than the sum of its proper divisors (256613281).

266620118399 is a wasteful number, since it uses less digits than its factorization.

266620118399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256613280.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 266620118399 in words is "two hundred sixty-six billion, six hundred twenty million, one hundred eighteen thousand, three hundred ninety-nine".