172051720039 has 2 divisors, whose sum is σ = 172051720040. Its totient is φ = 172051720038.

The previous prime is 172051720037. The next prime is 172051720051. The reversal of 172051720039 is 930027150271.

172051720039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172051720039 - 2¹ = 172051720037 is a prime.

Together with 172051720037, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172051720033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86025860019 + 86025860020.

It is an arithmetic number, because the mean of its divisors is an integer number (86025860020).

Almost surely, 2^172051720039 is an apocalyptic number.

172051720039 is a deficient number, since it is larger than the sum of its proper divisors (1).

172051720039 is an equidigital number, since it uses as much as digits as its factorization.

172051720039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 37.

The spelling of 172051720039 in words is "one hundred seventy-two billion, fifty-one million, seven hundred twenty thousand, thirty-nine".