1266205461 has 4 divisors (see below), whose sum is σ = 1688273952. Its totient is φ = 844136972.

The previous prime is 1266205459. The next prime is 1266205529. The reversal of 1266205461 is 1645026621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1266205461 - 2¹ = 1266205459 is a prime.

It is a super-3 number, since 3×1266205461³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266205411) 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, 211034241 + ... + 211034246.

It is an arithmetic number, because the mean of its divisors is an integer number (422068488).

Almost surely, 2^1266205461 is an apocalyptic number.

It is an amenable number.

1266205461 is a deficient number, since it is larger than the sum of its proper divisors (422068491).

1266205461 is an equidigital number, since it uses as much as digits as its factorization.

1266205461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422068490.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1266205461 is about 35583.7808699413. The cubic root of 1266205461 is about 1081.8525192960.

The spelling of 1266205461 in words is "one billion, two hundred sixty-six million, two hundred five thousand, four hundred sixty-one".