19571366398139 has 2 divisors, whose sum is σ = 19571366398140. Its totient is φ = 19571366398138.

The previous prime is 19571366398121. The next prime is 19571366398183. The reversal of 19571366398139 is 93189366317591.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19571366398139 is a prime.

It is not a weakly prime, because it can be changed into another prime (19571366388139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9785683199069 + 9785683199070.

It is an arithmetic number, because the mean of its divisors is an integer number (9785683199070).

Almost surely, 2^{19571366398139} is an apocalyptic number.

19571366398139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19571366398139 is an equidigital number, since it uses as much as digits as its factorization.

19571366398139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198404640, while the sum is 71.

The spelling of 19571366398139 in words is "nineteen trillion, five hundred seventy-one billion, three hundred sixty-six million, three hundred ninety-eight thousand, one hundred thirty-nine".