39925905673 has 2 divisors, whose sum is σ = 39925905674. Its totient is φ = 39925905672.

The previous prime is 39925905659. The next prime is 39925905703. The reversal of 39925905673 is 37650952993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21432081609 + 18493824064 = 146397^2 + 135992^2 .

It is an emirp because it is prime and its reverse (37650952993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39925905673 - 2³³ = 31335971081 is a prime.

It is not a weakly prime, because it can be changed into another prime (39925905653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19962952836 + 19962952837.

It is an arithmetic number, because the mean of its divisors is an integer number (19962952837).

Almost surely, 2^39925905673 is an apocalyptic number.

It is an amenable number.

39925905673 is a deficient number, since it is larger than the sum of its proper divisors (1).

39925905673 is an equidigital number, since it uses as much as digits as its factorization.

39925905673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13778100, while the sum is 58.

The spelling of 39925905673 in words is "thirty-nine billion, nine hundred twenty-five million, nine hundred five thousand, six hundred seventy-three".