27573606666 has 24 divisors (see below), whose sum is σ = 59964917220. Its totient is φ = 9157032576.

The previous prime is 27573606661. The next prime is 27573606677. The reversal of 27573606666 is 66660637572.

It can be written as a sum of positive squares in 2 ways, for example, as 19664172441 + 7909434225 = 140229^2 + 88935^2 .

It is a super-3 number, since 3×27573606666³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (27573606661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2842495 + ... + 2852178.

Almost surely, 2^27573606666 is an apocalyptic number.

27573606666 is an abundant number, since it is smaller than the sum of its proper divisors (32391310554).

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

27573606666 is a wasteful number, since it uses less digits than its factorization.

27573606666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694950 (or 5694947 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 54.

The spelling of 27573606666 in words is "twenty-seven billion, five hundred seventy-three million, six hundred six thousand, six hundred sixty-six".