19539426005908 has 6 divisors (see below), whose sum is σ = 34193995510346. Its totient is φ = 9769713002952.

The previous prime is 19539426005881. The next prime is 19539426005909. The reversal of 19539426005908 is 80950062493591.

It can be written as a sum of positive squares in only one way, i.e., 14991903875844 + 4547522130064 = 3871938^2 + 2132492^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19539426005909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2442428250735 + ... + 2442428250742.

Almost surely, 2^{19539426005908} is an apocalyptic number.

It is an amenable number.

19539426005908 is a deficient number, since it is larger than the sum of its proper divisors (14654569504438).

19539426005908 is a wasteful number, since it uses less digits than its factorization.

19539426005908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884856501481 (or 4884856501479 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 61.

The spelling of 19539426005908 in words is "nineteen trillion, five hundred thirty-nine billion, four hundred twenty-six million, five thousand, nine hundred eight".