27776265197 has 2 divisors, whose sum is σ = 27776265198. Its totient is φ = 27776265196.

The previous prime is 27776265089. The next prime is 27776265211. The reversal of 27776265197 is 79156267772.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21909624361 + 5866640836 = 148019^2 + 76594^2 .

It is a cyclic number.

It is not a de Polignac number, because 27776265197 - 2⁸ = 27776264941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27796265197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888132598 + 13888132599.

It is an arithmetic number, because the mean of its divisors is an integer number (13888132599).

Almost surely, 2^27776265197 is an apocalyptic number.

It is an amenable number.

27776265197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27776265197 is an equidigital number, since it uses as much as digits as its factorization.

27776265197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15558480, while the sum is 59.

The spelling of 27776265197 in words is "twenty-seven billion, seven hundred seventy-six million, two hundred sixty-five thousand, one hundred ninety-seven".