27780333197 has 2 divisors, whose sum is σ = 27780333198. Its totient is φ = 27780333196.

The previous prime is 27780333101. The next prime is 27780333209. The reversal of 27780333197 is 79133308772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26938985161 + 841348036 = 164131^2 + 29006^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780333197 - 2⁸ = 27780332941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27780333697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890166598 + 13890166599.

It is an arithmetic number, because the mean of its divisors is an integer number (13890166599).

Almost surely, 2^27780333197 is an apocalyptic number.

It is an amenable number.

27780333197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780333197 is an equidigital number, since it uses as much as digits as its factorization.

27780333197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 50.

The spelling of 27780333197 in words is "twenty-seven billion, seven hundred eighty million, three hundred thirty-three thousand, one hundred ninety-seven".