172423642806647 has 2 divisors, whose sum is σ = 172423642806648. Its totient is φ = 172423642806646.

The previous prime is 172423642806643. The next prime is 172423642806659. The reversal of 172423642806647 is 746608246324271.

It is a weak prime.

It is an emirp because it is prime and its reverse (746608246324271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172423642806647 - 2² = 172423642806643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172423642806647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172423642806643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86211821403323 + 86211821403324.

It is an arithmetic number, because the mean of its divisors is an integer number (86211821403324).

Almost surely, 2^{172423642806647} is an apocalyptic number.

172423642806647 is a deficient number, since it is larger than the sum of its proper divisors (1).

172423642806647 is an equidigital number, since it uses as much as digits as its factorization.

172423642806647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 130056192, while the sum is 62.

The spelling of 172423642806647 in words is "one hundred seventy-two trillion, four hundred twenty-three billion, six hundred forty-two million, eight hundred six thousand, six hundred forty-seven".