172205178213 has 16 divisors (see below), whose sum is σ = 230342112000. Its totient is φ = 114436169664.

The previous prime is 172205178209. The next prime is 172205178217. The reversal of 172205178213 is 312871502271.

It is an interprime number because it is at equal distance from previous prime (172205178209) and next prime (172205178217).

It is not a de Polignac number, because 172205178213 - 2² = 172205178209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172205178217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2168788 + ... + 2246786.

It is an arithmetic number, because the mean of its divisors is an integer number (14396382000).

Almost surely, 2^172205178213 is an apocalyptic number.

It is an amenable number.

172205178213 is a deficient number, since it is larger than the sum of its proper divisors (58136933787).

172205178213 is a wasteful number, since it uses less digits than its factorization.

172205178213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80348.

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 172205178213 in words is "one hundred seventy-two billion, two hundred five million, one hundred seventy-eight thousand, two hundred thirteen".