266505276890 has 32 divisors (see below), whose sum is σ = 482625251856. Its totient is φ = 105954531840.

The previous prime is 266505276889. The next prime is 266505276913. The reversal of 266505276890 is 98672505662.

It can be written as a sum of positive squares in 8 ways, for example, as 33680691529 + 232824585361 = 183523^2 + 482519^2 .

It is a super-2 number, since 2×266505276890² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6333320 + ... + 6375260.

Almost surely, 2^266505276890 is an apocalyptic number.

266505276890 is a deficient number, since it is larger than the sum of its proper divisors (216119974966).

266505276890 is a wasteful number, since it uses less digits than its factorization.

266505276890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45794.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 266505276890 in words is "two hundred sixty-six billion, five hundred five million, two hundred seventy-six thousand, eight hundred ninety".