172161305211 has 32 divisors (see below), whose sum is σ = 264086245888. Its totient is φ = 97723791360.

The previous prime is 172161305177. The next prime is 172161305263. The reversal of 172161305211 is 112503161271.

It is not a de Polignac number, because 172161305211 - 2²³ = 172152916603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172161325211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19919451 + ... + 19928091.

It is an arithmetic number, because the mean of its divisors is an integer number (8252695184).

Almost surely, 2^172161305211 is an apocalyptic number.

172161305211 is a deficient number, since it is larger than the sum of its proper divisors (91924940677).

172161305211 is a wasteful number, since it uses less digits than its factorization.

172161305211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14851.

The product of its (nonzero) digits is 2520, while the sum is 30.

Adding to 172161305211 its reverse (112503161271), we get a palindrome (284664466482).

The spelling of 172161305211 in words is "one hundred seventy-two billion, one hundred sixty-one million, three hundred five thousand, two hundred eleven".