266135136257 has 4 divisors (see below), whose sum is σ = 266137773636. Its totient is φ = 266132498880.

The previous prime is 266135136233. The next prime is 266135136259. The reversal of 266135136257 is 752631531662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752631531662 = 2 ⋅376315765831.

It can be written as a sum of positive squares in 2 ways, for example, as 133616567296 + 132518568961 = 365536^2 + 364031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266135136257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266135136259) 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, 1161044 + ... + 1371237.

It is an arithmetic number, because the mean of its divisors is an integer number (66534443409).

Almost surely, 2^266135136257 is an apocalyptic number.

It is an amenable number.

266135136257 is a deficient number, since it is larger than the sum of its proper divisors (2637379).

266135136257 is a wasteful number, since it uses less digits than its factorization.

266135136257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637378.

The product of its digits is 1360800, while the sum is 47.

The spelling of 266135136257 in words is "two hundred sixty-six billion, one hundred thirty-five million, one hundred thirty-six thousand, two hundred fifty-seven".