266540138790 has 16 divisors (see below), whose sum is σ = 639696333168. Its totient is φ = 71077370336.

The previous prime is 266540138779. The next prime is 266540138791. The reversal of 266540138790 is 97831045662.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266540138791) 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, 4442335617 + ... + 4442335676.

It is an arithmetic number, because the mean of its divisors is an integer number (39981020823).

It is a 1-persistent number, because it is pandigital, but 2⋅266540138790 = 533080277580 is not.

Almost surely, 2^266540138790 is an apocalyptic number.

266540138790 is an abundant number, since it is smaller than the sum of its proper divisors (373156194378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266540138790 is a wasteful number, since it uses less digits than its factorization.

266540138790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8884671303.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 266540138790 in words is "two hundred sixty-six billion, five hundred forty million, one hundred thirty-eight thousand, seven hundred ninety".