1266175261 has 16 divisors (see below), whose sum is σ = 1402386048. Its totient is φ = 1135598400.

The previous prime is 1266175213. The next prime is 1266175279. The reversal of 1266175261 is 1625716621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1266175261 - 2¹¹ = 1266173213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266175261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266175661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465696 + ... + 468406.

It is an arithmetic number, because the mean of its divisors is an integer number (87649128).

Almost surely, 2^1266175261 is an apocalyptic number.

It is an amenable number.

1266175261 is a deficient number, since it is larger than the sum of its proper divisors (136210787).

1266175261 is a wasteful number, since it uses less digits than its factorization.

1266175261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732.

The product of its digits is 30240, while the sum is 37.

The square root of 1266175261 is about 35583.3565167762. The cubic root of 1266175261 is about 1081.8439182154.

It can be divided in two parts, 1266175 and 261, that added together give a triangular number (1266436 = T₁₅₉₁).

The spelling of 1266175261 in words is "one billion, two hundred sixty-six million, one hundred seventy-five thousand, two hundred sixty-one".