27115661 has 4 divisors (see below), whose sum is σ = 27234300. Its totient is φ = 26997024.

The previous prime is 27115651. The next prime is 27115691. The reversal of 27115661 is 16651172.

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 24940036 + 2175625 = 4994^2 + 1475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27115661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27115651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58976 + ... + 59433.

It is an arithmetic number, because the mean of its divisors is an integer number (6808575).

Almost surely, 2^27115661 is an apocalyptic number.

It is an amenable number.

27115661 is a deficient number, since it is larger than the sum of its proper divisors (118639).

27115661 is a wasteful number, since it uses less digits than its factorization.

27115661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118638.

The product of its digits is 2520, while the sum is 29.

The square root of 27115661 is about 5207.2700141245. The cubic root of 27115661 is about 300.4277638445.

The spelling of 27115661 in words is "twenty-seven million, one hundred fifteen thousand, six hundred sixty-one".