266642674517 has 4 divisors (see below), whose sum is σ = 270398205216. Its totient is φ = 262887143820.

The previous prime is 266642674481. The next prime is 266642674531. The reversal of 266642674517 is 715476246662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266642674517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266642671517) 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, 1877765243 + ... + 1877765384.

It is an arithmetic number, because the mean of its divisors is an integer number (67599551304).

Almost surely, 2^266642674517 is an apocalyptic number.

It is an amenable number.

266642674517 is a deficient number, since it is larger than the sum of its proper divisors (3755530699).

266642674517 is an equidigital number, since it uses as much as digits as its factorization.

266642674517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755530698.

The product of its digits is 20321280, while the sum is 56.

The spelling of 266642674517 in words is "two hundred sixty-six billion, six hundred forty-two million, six hundred seventy-four thousand, five hundred seventeen".