39955384909481 has 2 divisors, whose sum is σ = 39955384909482. Its totient is φ = 39955384909480.

The previous prime is 39955384909423. The next prime is 39955384909577. The reversal of 39955384909481 is 18490948355993.

39955384909481 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., 39216601683856 + 738783225625 = 6262316^2 + 859525^2 .

It is a cyclic number.

It is not a de Polignac number, because 39955384909481 - 2³⁸ = 39680507002537 is a prime.

It is a super-3 number, since 3×39955384909481³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (39955384905481) 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, 19977692454740 + 19977692454741.

It is an arithmetic number, because the mean of its divisors is an integer number (19977692454741).

Almost surely, 2^{39955384909481} is an apocalyptic number.

It is an amenable number.

39955384909481 is a deficient number, since it is larger than the sum of its proper divisors (1).

39955384909481 is an equidigital number, since it uses as much as digits as its factorization.

39955384909481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1511654400, while the sum is 77.

The spelling of 39955384909481 in words is "thirty-nine trillion, nine hundred fifty-five billion, three hundred eighty-four million, nine hundred nine thousand, four hundred eighty-one".