171728639099 has 2 divisors, whose sum is σ = 171728639100. Its totient is φ = 171728639098.

The previous prime is 171728639023. The next prime is 171728639111. The reversal of 171728639099 is 990936827171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171728639099 - 2²⁸ = 171460203643 is a prime.

It is not a weakly prime, because it can be changed into another prime (171728636099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85864319549 + 85864319550.

It is an arithmetic number, because the mean of its divisors is an integer number (85864319550).

Almost surely, 2^171728639099 is an apocalyptic number.

171728639099 is a deficient number, since it is larger than the sum of its proper divisors (1).

171728639099 is an equidigital number, since it uses as much as digits as its factorization.

171728639099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10287648, while the sum is 62.

The spelling of 171728639099 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, six hundred thirty-nine thousand, ninety-nine".