39505520581979 has 2 divisors, whose sum is σ = 39505520581980. Its totient is φ = 39505520581978.

The previous prime is 39505520581939. The next prime is 39505520581981. The reversal of 39505520581979 is 97918502550593.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39505520581979 - 2¹⁶ = 39505520516443 is a prime.

Together with 39505520581981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39505520581939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19752760290989 + 19752760290990.

It is an arithmetic number, because the mean of its divisors is an integer number (19752760290990).

Almost surely, 2^{39505520581979} is an apocalyptic number.

39505520581979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39505520581979 is an equidigital number, since it uses as much as digits as its factorization.

39505520581979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090000, while the sum is 68.

The spelling of 39505520581979 in words is "thirty-nine trillion, five hundred five billion, five hundred twenty million, five hundred eighty-one thousand, nine hundred seventy-nine".