27155526197 has 2 divisors, whose sum is σ = 27155526198. Its totient is φ = 27155526196.

The previous prime is 27155526193. The next prime is 27155526239. The reversal of 27155526197 is 79162555172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27154425796 + 1100401 = 164786^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 27155526197 - 2² = 27155526193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27155526193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13577763098 + 13577763099.

It is an arithmetic number, because the mean of its divisors is an integer number (13577763099).

Almost surely, 2^27155526197 is an apocalyptic number.

It is an amenable number.

27155526197 is a deficient number, since it is larger than the sum of its proper divisors (1).

27155526197 is an equidigital number, since it uses as much as digits as its factorization.

27155526197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 50.

The spelling of 27155526197 in words is "twenty-seven billion, one hundred fifty-five million, five hundred twenty-six thousand, one hundred ninety-seven".