1266225011 has 4 divisors (see below), whose sum is σ = 1266431592. Its totient is φ = 1266018432.

The previous prime is 1266225001. The next prime is 1266225029. The reversal of 1266225011 is 1105226621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1105226621 = 27457 ⋅40253.

It is a cyclic number.

It is not a de Polignac number, because 1266225011 - 2²⁶ = 1199116147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266225001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93806 + ... + 106451.

It is an arithmetic number, because the mean of its divisors is an integer number (316607898).

Almost surely, 2^1266225011 is an apocalyptic number.

1266225011 is a deficient number, since it is larger than the sum of its proper divisors (206581).

1266225011 is an equidigital number, since it uses as much as digits as its factorization.

1266225011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206580.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1266225011 is about 35584.0555726859. The cubic root of 1266225011 is about 1081.8580871412.

It can be divided in two parts, 12662 and 25011, that added together give a palindrome (37673).

The spelling of 1266225011 in words is "one billion, two hundred sixty-six million, two hundred twenty-five thousand, eleven".