266762491 has 2 divisors, whose sum is σ = 266762492. Its totient is φ = 266762490.

The previous prime is 266762467. The next prime is 266762557. The reversal of 266762491 is 194267662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266762491 - 2¹¹ = 266760443 is a prime.

It is not a weakly prime, because it can be changed into another prime (266762291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133381245 + 133381246.

It is an arithmetic number, because the mean of its divisors is an integer number (133381246).

Almost surely, 2^266762491 is an apocalyptic number.

266762491 is a deficient number, since it is larger than the sum of its proper divisors (1).

266762491 is an equidigital number, since it uses as much as digits as its factorization.

266762491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 266762491 is about 16332.8653640444. The cubic root of 266762491 is about 643.7366783180.

The spelling of 266762491 in words is "two hundred sixty-six million, seven hundred sixty-two thousand, four hundred ninety-one".