172581704213 has 4 divisors (see below), whose sum is σ = 173003664780. Its totient is φ = 172159743648.

The previous prime is 172581704173. The next prime is 172581704249. The reversal of 172581704213 is 312407185271.

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 144417480529 + 28164223684 = 380023^2 + 167822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172581704213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172581764213) 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, 210979670 + ... + 210980487.

It is an arithmetic number, because the mean of its divisors is an integer number (43250916195).

Almost surely, 2^172581704213 is an apocalyptic number.

It is an amenable number.

172581704213 is a deficient number, since it is larger than the sum of its proper divisors (421960567).

172581704213 is an equidigital number, since it uses as much as digits as its factorization.

172581704213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421960566.

The product of its (nonzero) digits is 94080, while the sum is 41.

Adding to 172581704213 its reverse (312407185271), we get a palindrome (484988889484).

The spelling of 172581704213 in words is "one hundred seventy-two billion, five hundred eighty-one million, seven hundred four thousand, two hundred thirteen".