27145666 has 4 divisors (see below), whose sum is σ = 40718502. Its totient is φ = 13572832.

The previous prime is 27145639. The next prime is 27145667. The reversal of 27145666 is 66654172.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 1390041 = 5075^2 + 1179^2 .

It is not an unprimeable number, because it can be changed into a prime (27145667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6786415 + ... + 6786418.

Almost surely, 2^27145666 is an apocalyptic number.

27145666 is a deficient number, since it is larger than the sum of its proper divisors (13572836).

27145666 is a wasteful number, since it uses less digits than its factorization.

27145666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13572835.

The product of its digits is 60480, while the sum is 37.

The square root of 27145666 is about 5210.1502857403. The cubic root of 27145666 is about 300.5385363871.

The spelling of 27145666 in words is "twenty-seven million, one hundred forty-five thousand, six hundred sixty-six".