172156722007 has 4 divisors (see below), whose sum is σ = 172487157696. Its totient is φ = 171826286320.

The previous prime is 172156721963. The next prime is 172156722041. The reversal of 172156722007 is 700227651271.

172156722007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172156722007 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172156722077) 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 in 3 ways as a sum of consecutive naturals, for example, 165217063 + ... + 165218104.

It is an arithmetic number, because the mean of its divisors is an integer number (43121789424).

Almost surely, 2^172156722007 is an apocalyptic number.

172156722007 is a deficient number, since it is larger than the sum of its proper divisors (330435689).

172156722007 is an equidigital number, since it uses as much as digits as its factorization.

172156722007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330435688.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 172156722007 in words is "one hundred seventy-two billion, one hundred fifty-six million, seven hundred twenty-two thousand, seven".