39990106806697 has 2 divisors, whose sum is σ = 39990106806698. Its totient is φ = 39990106806696.

The previous prime is 39990106806677. The next prime is 39990106806731. The reversal of 39990106806697 is 79660860109993.

39990106806697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32185436514841 + 7804670291856 = 5673221^2 + 2793684^2 .

It is a cyclic number.

It is not a de Polignac number, because 39990106806697 - 2¹¹ = 39990106804649 is a prime.

It is a super-2 number, since 2×39990106806697² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39990106806677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19995053403348 + 19995053403349.

It is an arithmetic number, because the mean of its divisors is an integer number (19995053403349).

Almost surely, 2^{39990106806697} is an apocalyptic number.

It is an amenable number.

39990106806697 is a deficient number, since it is larger than the sum of its proper divisors (1).

39990106806697 is an equidigital number, since it uses as much as digits as its factorization.

39990106806697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238085568, while the sum is 73.

The spelling of 39990106806697 in words is "thirty-nine trillion, nine hundred ninety billion, one hundred six million, eight hundred six thousand, six hundred ninety-seven".