27121666 has 48 divisors (see below), whose sum is σ = 49670712. Its totient is φ = 11024640.

The previous prime is 27121663. The next prime is 27121687. The reversal of 27121666 is 66612172.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20439441 + 6682225 = 4521^2 + 2585^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27121663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116286 + ... + 116518.

Almost surely, 2^27121666 is an apocalyptic number.

27121666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

27121666 is a deficient number, since it is larger than the sum of its proper divisors (22549046).

27121666 is a wasteful number, since it uses less digits than its factorization.

27121666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 296 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 27121666 is about 5207.8465799215. The cubic root of 27121666 is about 300.4499396585.

It can be divided in two parts, 2712166 and 6, that added together give a palindrome (2712172).

The spelling of 27121666 in words is "twenty-seven million, one hundred twenty-one thousand, six hundred sixty-six".