999999371665139 has 2 divisors, whose sum is σ = 999999371665140. Its totient is φ = 999999371665138.

The previous prime is 999999371665081. The next prime is 999999371665187. The reversal of 999999371665139 is 931566173999999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999999371665139 - 2⁴⁰ = 998899860037363 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999371662139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999685832569 + 499999685832570.

It is an arithmetic number, because the mean of its divisors is an integer number (499999685832570).

Almost surely, 2^{999999371665139} is an apocalyptic number.

999999371665139 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999371665139 is an equidigital number, since it uses as much as digits as its factorization.

999999371665139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54238868460, while the sum is 95.

The spelling of 999999371665139 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, three hundred seventy-one million, six hundred sixty-five thousand, one hundred thirty-nine".