39845838169 has 2 divisors, whose sum is σ = 39845838170. Its totient is φ = 39845838168.

The previous prime is 39845838101. The next prime is 39845838191. The reversal of 39845838169 is 96183854893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38695610944 + 1150227225 = 196712^2 + 33915^2 .

It is a cyclic number.

It is not a de Polignac number, because 39845838169 - 2⁷ = 39845838041 is a prime.

It is a super-2 number, since 2×39845838169² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39845838169.

It is not a weakly prime, because it can be changed into another prime (39845848169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19922919084 + 19922919085.

It is an arithmetic number, because the mean of its divisors is an integer number (19922919085).

Almost surely, 2^39845838169 is an apocalyptic number.

It is an amenable number.

39845838169 is a deficient number, since it is larger than the sum of its proper divisors (1).

39845838169 is an equidigital number, since it uses as much as digits as its factorization.

39845838169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44789760, while the sum is 64.

The spelling of 39845838169 in words is "thirty-nine billion, eight hundred forty-five million, eight hundred thirty-eight thousand, one hundred sixty-nine".