39455856917 has 2 divisors, whose sum is σ = 39455856918. Its totient is φ = 39455856916.

The previous prime is 39455856863. The next prime is 39455856919. The reversal of 39455856917 is 71965855493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24448136881 + 15007720036 = 156359^2 + 122506^2 .

It is a cyclic number.

It is not a de Polignac number, because 39455856917 - 2¹⁴ = 39455840533 is a prime.

Together with 39455856919, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39455856917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39455856919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19727928458 + 19727928459.

It is an arithmetic number, because the mean of its divisors is an integer number (19727928459).

Almost surely, 2^39455856917 is an apocalyptic number.

It is an amenable number.

39455856917 is a deficient number, since it is larger than the sum of its proper divisors (1).

39455856917 is an equidigital number, since it uses as much as digits as its factorization.

39455856917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824000, while the sum is 62.

The spelling of 39455856917 in words is "thirty-nine billion, four hundred fifty-five million, eight hundred fifty-six thousand, nine hundred seventeen".