1266133251 has 8 divisors (see below), whose sum is σ = 1698931024. Its totient is φ = 838712160.

The previous prime is 1266133249. The next prime is 1266133277. The reversal of 1266133251 is 1523316621.

1266133251 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266133251 - 2¹ = 1266133249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266133201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1343620 + ... + 1344561.

It is an arithmetic number, because the mean of its divisors is an integer number (212366378).

Almost surely, 2^1266133251 is an apocalyptic number.

1266133251 is a deficient number, since it is larger than the sum of its proper divisors (432797773).

1266133251 is a wasteful number, since it uses less digits than its factorization.

1266133251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688341.

The product of its digits is 6480, while the sum is 30.

The square root of 1266133251 is about 35582.7662078147. The cubic root of 1266133251 is about 1081.8319533721.

Adding to 1266133251 its reverse (1523316621), we get a palindrome (2789449872).

The spelling of 1266133251 in words is "one billion, two hundred sixty-six million, one hundred thirty-three thousand, two hundred fifty-one".