1266075481 has 4 divisors (see below), whose sum is σ = 1381173264. Its totient is φ = 1150977700.

The previous prime is 1266075407. The next prime is 1266075487. The reversal of 1266075481 is 1845706621.

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 1266075481 - 2¹³ = 1266067289 is a prime.

It is a super-2 number, since 2×1266075481² = 3205894247178762722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266075487) 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, 57548875 + ... + 57548896.

It is an arithmetic number, because the mean of its divisors is an integer number (345293316).

Almost surely, 2^1266075481 is an apocalyptic number.

1266075481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1266075481 is a deficient number, since it is larger than the sum of its proper divisors (115097783).

1266075481 is a wasteful number, since it uses less digits than its factorization.

1266075481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115097782.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1266075481 is about 35581.9544291766. The cubic root of 1266075481 is about 1081.8154995003.

The spelling of 1266075481 in words is "one billion, two hundred sixty-six million, seventy-five thousand, four hundred eighty-one".