27775613989 has 2 divisors, whose sum is σ = 27775613990. Its totient is φ = 27775613988.

The previous prime is 27775613977. The next prime is 27775614043. The reversal of 27775613989 is 98931657772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23522356900 + 4253257089 = 153370^2 + 65217^2 .

It is a cyclic number.

It is not a de Polignac number, because 27775613989 - 2¹³ = 27775605797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27775613989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27775613189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13887806994 + 13887806995.

It is an arithmetic number, because the mean of its divisors is an integer number (13887806995).

Almost surely, 2^27775613989 is an apocalyptic number.

It is an amenable number.

27775613989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27775613989 is an equidigital number, since it uses as much as digits as its factorization.

27775613989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40007520, while the sum is 64.

The spelling of 27775613989 in words is "twenty-seven billion, seven hundred seventy-five million, six hundred thirteen thousand, nine hundred eighty-nine".