27400661 has 2 divisors, whose sum is σ = 27400662. Its totient is φ = 27400660.

The previous prime is 27400643. The next prime is 27400663. The reversal of 27400661 is 16600472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24196561 + 3204100 = 4919^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 27400661 - 2¹⁴ = 27384277 is a prime.

Together with 27400663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27400661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27400663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13700330 + 13700331.

It is an arithmetic number, because the mean of its divisors is an integer number (13700331).

Almost surely, 2^27400661 is an apocalyptic number.

It is an amenable number.

27400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27400661 is an equidigital number, since it uses as much as digits as its factorization.

27400661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 27400661 is about 5234.5640697197. The cubic root of 27400661 is about 301.4766493929.

The spelling of 27400661 in words is "twenty-seven million, four hundred thousand, six hundred sixty-one".