39664191169 has 2 divisors, whose sum is σ = 39664191170. Its totient is φ = 39664191168.

The previous prime is 39664191097. The next prime is 39664191181. The reversal of 39664191169 is 96119146693.

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., 26736501169 + 12927690000 = 163513^2 + 113700^2 .

It is a cyclic number.

It is not a de Polignac number, because 39664191169 - 2⁷ = 39664191041 is a prime.

It is a super-2 number, since 2×39664191169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39664191269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19832095584 + 19832095585.

It is an arithmetic number, because the mean of its divisors is an integer number (19832095585).

Almost surely, 2^39664191169 is an apocalyptic number.

It is an amenable number.

39664191169 is a deficient number, since it is larger than the sum of its proper divisors (1).

39664191169 is an equidigital number, since it uses as much as digits as its factorization.

39664191169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 55.

The spelling of 39664191169 in words is "thirty-nine billion, six hundred sixty-four million, one hundred ninety-one thousand, one hundred sixty-nine".