266255031645 has 48 divisors (see below), whose sum is σ = 488751859440. Its totient is φ = 133623447552.

The previous prime is 266255031613. The next prime is 266255031649. The reversal of 266255031645 is 546130552662.

266255031645 is a `hidden beast` number, since 2 + 6 + 6 + 2 + 550 + 31 + 64 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 7063057764 + 259191973881 = 84042^2 + 509109^2 .

It is not a de Polignac number, because 266255031645 - 2⁵ = 266255031613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 266255031645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266255031649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4229037 + ... + 4291533.

It is an arithmetic number, because the mean of its divisors is an integer number (10182330405).

Almost surely, 2^266255031645 is an apocalyptic number.

It is an amenable number.

266255031645 is a deficient number, since it is larger than the sum of its proper divisors (222496827795).

266255031645 is a wasteful number, since it uses less digits than its factorization.

266255031645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68094 (or 68091 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 266255031645 in words is "two hundred sixty-six billion, two hundred fifty-five million, thirty-one thousand, six hundred forty-five".