172116106171601 has 4 divisors (see below), whose sum is σ = 172737463955892. Its totient is φ = 171494748387312.

The previous prime is 172116106171487. The next prime is 172116106171637. The reversal of 172116106171601 is 106171601611271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105334505827600 + 66781600344001 = 10263260^2 + 8172001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172116106171601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172116106174601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310678891730 + ... + 310678892283.

It is an arithmetic number, because the mean of its divisors is an integer number (43184365988973).

Almost surely, 2^{172116106171601} is an apocalyptic number.

It is an amenable number.

172116106171601 is a deficient number, since it is larger than the sum of its proper divisors (621357784291).

172116106171601 is an equidigital number, since it uses as much as digits as its factorization.

172116106171601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621357784290.

The product of its (nonzero) digits is 21168, while the sum is 41.

Adding to 172116106171601 its reverse (106171601611271), we get a palindrome (278287707782872).

The spelling of 172116106171601 in words is "one hundred seventy-two trillion, one hundred sixteen billion, one hundred six million, one hundred seventy-one thousand, six hundred one".