1266001111 has 2 divisors, whose sum is σ = 1266001112. Its totient is φ = 1266001110.

The previous prime is 1266001049. The next prime is 1266001117. The reversal of 1266001111 is 1111006621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266001111 - 2²⁵ = 1232446679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266001117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633000555 + 633000556.

It is an arithmetic number, because the mean of its divisors is an integer number (633000556).

Almost surely, 2^1266001111 is an apocalyptic number.

1266001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266001111 is an equidigital number, since it uses as much as digits as its factorization.

1266001111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1266001111 is about 35580.9093616226. The cubic root of 1266001111 is about 1081.7943169312.

Adding to 1266001111 its reverse (1111006621), we get a palindrome (2377007732).

The spelling of 1266001111 in words is "one billion, two hundred sixty-six million, one thousand, one hundred eleven".