27156661 has 8 divisors (see below), whose sum is σ = 31072064. Its totient is φ = 23250240.

The previous prime is 27156653. The next prime is 27156709. The reversal of 27156661 is 16665172.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27156661 - 2³ = 27156653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27156601) 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 in 7 ways as a sum of consecutive naturals, for example, 6541 + ... + 9853.

It is an arithmetic number, because the mean of its divisors is an integer number (3884008).

Almost surely, 2^27156661 is an apocalyptic number.

It is an amenable number.

27156661 is a deficient number, since it is larger than the sum of its proper divisors (3915403).

27156661 is a wasteful number, since it uses less digits than its factorization.

27156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491.

The product of its digits is 15120, while the sum is 34.

The square root of 27156661 is about 5211.2053308232. The cubic root of 27156661 is about 300.5791073223.

The spelling of 27156661 in words is "twenty-seven million, one hundred fifty-six thousand, six hundred sixty-one".