27345781009 has 2 divisors, whose sum is σ = 27345781010. Its totient is φ = 27345781008.

The previous prime is 27345780991. The next prime is 27345781051. The reversal of 27345781009 is 90018754372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23233380625 + 4112400384 = 152425^2 + 64128^2 .

It is a cyclic number.

It is not a de Polignac number, because 27345781009 - 2²⁹ = 26808910097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27345781009.

It is not a weakly prime, because it can be changed into another prime (27345781079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13672890504 + 13672890505.

It is an arithmetic number, because the mean of its divisors is an integer number (13672890505).

Almost surely, 2^27345781009 is an apocalyptic number.

It is an amenable number.

27345781009 is a deficient number, since it is larger than the sum of its proper divisors (1).

27345781009 is an equidigital number, since it uses as much as digits as its factorization.

27345781009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 27345781009 in words is "twenty-seven billion, three hundred forty-five million, seven hundred eighty-one thousand, nine".