27771623149 has 2 divisors, whose sum is σ = 27771623150. Its totient is φ = 27771623148.

The previous prime is 27771623093. The next prime is 27771623177. The reversal of 27771623149 is 94132617772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26770849924 + 1000773225 = 163618^2 + 31635^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771623149 - 2⁷ = 27771623021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27771623449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885811574 + 13885811575.

It is an arithmetic number, because the mean of its divisors is an integer number (13885811575).

Almost surely, 2^27771623149 is an apocalyptic number.

It is an amenable number.

27771623149 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771623149 is an equidigital number, since it uses as much as digits as its factorization.

27771623149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The spelling of 27771623149 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred twenty-three thousand, one hundred forty-nine".