65564197 has 2 divisors, whose sum is σ = 65564198. Its totient is φ = 65564196.

The previous prime is 65564179. The next prime is 65564209. The reversal of 65564197 is 79146556.

Together with previous prime (65564179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 3690241 = 7866^2 + 1921^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564197 - 2¹⁵ = 65531429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65564137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32782098 + 32782099.

It is an arithmetic number, because the mean of its divisors is an integer number (32782099).

Almost surely, 2^65564197 is an apocalyptic number.

It is an amenable number.

65564197 is a deficient number, since it is larger than the sum of its proper divisors (1).

65564197 is an equidigital number, since it uses as much as digits as its factorization.

65564197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The square root of 65564197 is about 8097.1721606991. The cubic root of 65564197 is about 403.2325499312.

It can be divided in two parts, 655 and 64197, that multiplied together give a triangular number (42049035 = T₉₁₇₀).

The spelling of 65564197 in words is "sixty-five million, five hundred sixty-four thousand, one hundred ninety-seven".