266687228565 has 24 divisors (see below), whose sum is σ = 462293945568. Its totient is φ = 142222086240.

The previous prime is 266687228531. The next prime is 266687228597. The reversal of 266687228565 is 565822786662.

It is a happy number.

It is not a de Polignac number, because 266687228565 - 2⁶ = 266687228501 is a prime.

It is a super-2 number, since 2×266687228565² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 368710 + ... + 818120.

It is an arithmetic number, because the mean of its divisors is an integer number (19262247732).

Almost surely, 2^266687228565 is an apocalyptic number.

It is an amenable number.

266687228565 is a deficient number, since it is larger than the sum of its proper divisors (195606717003).

266687228565 is a wasteful number, since it uses less digits than its factorization.

266687228565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462609 (or 462606 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 63.

The spelling of 266687228565 in words is "two hundred sixty-six billion, six hundred eighty-seven million, two hundred twenty-eight thousand, five hundred sixty-five".