65168809 has 2 divisors, whose sum is σ = 65168810. Its totient is φ = 65168808.

The previous prime is 65168783. The next prime is 65168819. The reversal of 65168809 is 90886156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 205209 = 8060^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 65168809 - 2¹⁷ = 65037737 is a prime.

It is not a weakly prime, because it can be changed into another prime (65168819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32584404 + 32584405.

It is an arithmetic number, because the mean of its divisors is an integer number (32584405).

Almost surely, 2^65168809 is an apocalyptic number.

It is an amenable number.

65168809 is a deficient number, since it is larger than the sum of its proper divisors (1).

65168809 is an equidigital number, since it uses as much as digits as its factorization.

65168809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 65168809 is about 8072.7200496487. The cubic root of 65168809 is about 402.4203440481.

The spelling of 65168809 in words is "sixty-five million, one hundred sixty-eight thousand, eight hundred nine".