266995205381 has 4 divisors (see below), whose sum is σ = 266997036000. Its totient is φ = 266993374764.

The previous prime is 266995205369. The next prime is 266995205383. The reversal of 266995205381 is 183502599662.

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-266995205381 is a prime.

It is a super-2 number, since 2×266995205381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266995205383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675611 + ... + 995208.

It is an arithmetic number, because the mean of its divisors is an integer number (66749259000).

Almost surely, 2^266995205381 is an apocalyptic number.

It is an amenable number.

266995205381 is a deficient number, since it is larger than the sum of its proper divisors (1830619).

266995205381 is a wasteful number, since it uses less digits than its factorization.

266995205381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830618.

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 266995205381 in words is "two hundred sixty-six billion, nine hundred ninety-five million, two hundred five thousand, three hundred eighty-one".