266687129 has 2 divisors, whose sum is σ = 266687130. Its totient is φ = 266687128.

The previous prime is 266687111. The next prime is 266687171. The reversal of 266687129 is 921786662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260757904 + 5929225 = 16148^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 266687129 - 2⁸ = 266686873 is a prime.

It is a super-2 number, since 2×266687129² = 142244049548525282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266687189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133343564 + 133343565.

It is an arithmetic number, because the mean of its divisors is an integer number (133343565).

Almost surely, 2^266687129 is an apocalyptic number.

It is an amenable number.

266687129 is a deficient number, since it is larger than the sum of its proper divisors (1).

266687129 is an equidigital number, since it uses as much as digits as its factorization.

266687129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 266687129 is about 16330.5581349812. The cubic root of 266687129 is about 643.6760527874.

The spelling of 266687129 in words is "two hundred sixty-six million, six hundred eighty-seven thousand, one hundred twenty-nine".