166019704493 has 4 divisors (see below), whose sum is σ = 166054419648. Its totient is φ = 165984989340.

The previous prime is 166019704463. The next prime is 166019704511. The reversal of 166019704493 is 394407910661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 394407910661 = 17 ⋅23200465333.

It is a cyclic number.

It is not a de Polignac number, because 166019704493 - 2³⁰ = 164945962669 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 (166019704423) 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, 17350403 + ... + 17359968.

It is an arithmetic number, because the mean of its divisors is an integer number (41513604912).

Almost surely, 2^166019704493 is an apocalyptic number.

It is an amenable number.

166019704493 is a deficient number, since it is larger than the sum of its proper divisors (34715155).

166019704493 is an equidigital number, since it uses as much as digits as its factorization.

166019704493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34715154.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 166019704493 in words is "one hundred sixty-six billion, nineteen million, seven hundred four thousand, four hundred ninety-three".