166701701701 has 4 divisors (see below), whose sum is σ = 176507684172. Its totient is φ = 156895719232.

The previous prime is 166701701681. The next prime is 166701701707. The reversal of 166701701701 is 107107107661.

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 123770276100 + 42931425601 = 351810^2 + 207199^2 .

It is a cyclic number.

It is not a de Polignac number, because 166701701701 - 2¹⁹ = 166701177413 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 (166701701707) 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, 4902991210 + ... + 4902991243.

It is an arithmetic number, because the mean of its divisors is an integer number (44126921043).

Almost surely, 2^166701701701 is an apocalyptic number.

It is an amenable number.

166701701701 is a deficient number, since it is larger than the sum of its proper divisors (9805982471).

166701701701 is an equidigital number, since it uses as much as digits as its factorization.

166701701701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9805982470.

The product of its (nonzero) digits is 12348, while the sum is 37.

The spelling of 166701701701 in words is "one hundred sixty-six billion, seven hundred one million, seven hundred one thousand, seven hundred one".