266502631261 has 24 divisors (see below), whose sum is σ = 272664190656. Its totient is φ = 260459709120.

The previous prime is 266502631237. The next prime is 266502631349. The reversal of 266502631261 is 162136205662.

It is a happy number.

It is not a de Polignac number, because 266502631261 - 2²³ = 266494242653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266502632261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323818096 + ... + 323818918.

It is an arithmetic number, because the mean of its divisors is an integer number (11361007944).

Almost surely, 2^266502631261 is an apocalyptic number.

It is an amenable number.

266502631261 is a deficient number, since it is larger than the sum of its proper divisors (6161559395).

266502631261 is a wasteful number, since it uses less digits than its factorization.

266502631261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 266502631261 in words is "two hundred sixty-six billion, five hundred two million, six hundred thirty-one thousand, two hundred sixty-one".