275666212081 has 4 divisors (see below), whose sum is σ = 296871305332. Its totient is φ = 254461118832.

The previous prime is 275666212067. The next prime is 275666212103. The reversal of 275666212081 is 180212666572.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73436122081 + 202230090000 = 270991^2 + 449700^2 .

It is a cyclic number.

It is not a de Polignac number, because 275666212081 - 2⁵ = 275666212049 is a prime.

It is a super-2 number, since 2×275666212081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (275666212681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10602546606 + ... + 10602546631.

It is an arithmetic number, because the mean of its divisors is an integer number (74217826333).

Almost surely, 2^275666212081 is an apocalyptic number.

It is an amenable number.

275666212081 is a deficient number, since it is larger than the sum of its proper divisors (21205093251).

275666212081 is a wasteful number, since it uses less digits than its factorization.

275666212081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21205093250.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 275666212081 in words is "two hundred seventy-five billion, six hundred sixty-six million, two hundred twelve thousand, eighty-one".