172685266493 has 2 divisors, whose sum is σ = 172685266494. Its totient is φ = 172685266492.

The previous prime is 172685266489. The next prime is 172685266517. The reversal of 172685266493 is 394662586271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163023752644 + 9661513849 = 403762^2 + 98293^2 .

It is a cyclic number.

It is not a de Polignac number, because 172685266493 - 2² = 172685266489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172685266423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86342633246 + 86342633247.

It is an arithmetic number, because the mean of its divisors is an integer number (86342633247).

Almost surely, 2^172685266493 is an apocalyptic number.

It is an amenable number.

172685266493 is a deficient number, since it is larger than the sum of its proper divisors (1).

172685266493 is an equidigital number, since it uses as much as digits as its factorization.

172685266493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 59.

The spelling of 172685266493 in words is "one hundred seventy-two billion, six hundred eighty-five million, two hundred sixty-six thousand, four hundred ninety-three".