166942793497 has 4 divisors (see below), whose sum is σ = 167017423716. Its totient is φ = 166868163280.

The previous prime is 166942793477. The next prime is 166942793509. The reversal of 166942793497 is 794397249661.

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 117440548416 + 49502245081 = 342696^2 + 222491^2 .

It is a cyclic number.

It is not a de Polignac number, because 166942793497 - 2¹⁹ = 166942269209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166942793417) 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, 37311754 + ... + 37316227.

It is an arithmetic number, because the mean of its divisors is an integer number (41754355929).

Almost surely, 2^166942793497 is an apocalyptic number.

It is an amenable number.

166942793497 is a deficient number, since it is larger than the sum of its proper divisors (74630219).

166942793497 is an equidigital number, since it uses as much as digits as its factorization.

166942793497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74630218.

The product of its digits is 123451776, while the sum is 67.

The spelling of 166942793497 in words is "one hundred sixty-six billion, nine hundred forty-two million, seven hundred ninety-three thousand, four hundred ninety-seven".