1266165137 has 4 divisors (see below), whose sum is σ = 1266330420. Its totient is φ = 1265999856.

The previous prime is 1266165107. The next prime is 1266165163. The reversal of 1266165137 is 7315616621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 530887681 + 735277456 = 23041^2 + 27116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266165137 - 2¹⁴ = 1266148753 is a prime.

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 1266165137.

It is not an unprimeable number, because it can be changed into a prime (1266165107) 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, 70562 + ... + 86667.

It is an arithmetic number, because the mean of its divisors is an integer number (316582605).

Almost surely, 2^1266165137 is an apocalyptic number.

It is an amenable number.

1266165137 is a deficient number, since it is larger than the sum of its proper divisors (165283).

1266165137 is an equidigital number, since it uses as much as digits as its factorization.

1266165137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165282.

The product of its digits is 45360, while the sum is 38.

The square root of 1266165137 is about 35583.2142589733. The cubic root of 1266165137 is about 1081.8410348291.

The spelling of 1266165137 in words is "one billion, two hundred sixty-six million, one hundred sixty-five thousand, one hundred thirty-seven".