172112823889 has 2 divisors, whose sum is σ = 172112823890. Its totient is φ = 172112823888.

The previous prime is 172112823821. The next prime is 172112823899. The reversal of 172112823889 is 988328211271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160086411664 + 12026412225 = 400108^2 + 109665^2 .

It is a cyclic number.

It is not a de Polignac number, because 172112823889 - 2²³ = 172104435281 is a prime.

It is not a weakly prime, because it can be changed into another prime (172112823899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86056411944 + 86056411945.

It is an arithmetic number, because the mean of its divisors is an integer number (86056411945).

Almost surely, 2^172112823889 is an apocalyptic number.

It is an amenable number.

172112823889 is a deficient number, since it is larger than the sum of its proper divisors (1).

172112823889 is an equidigital number, since it uses as much as digits as its factorization.

172112823889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 52.

The spelling of 172112823889 in words is "one hundred seventy-two billion, one hundred twelve million, eight hundred twenty-three thousand, eight hundred eighty-nine".