169666421079 has 16 divisors (see below), whose sum is σ = 231215022720. Its totient is φ = 110635102560.

The previous prime is 169666421063. The next prime is 169666421083. The reversal of 169666421079 is 970124666961.

It is not a de Polignac number, because 169666421079 - 2⁴ = 169666421063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169666421579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2557017 + ... + 2622530.

It is an arithmetic number, because the mean of its divisors is an integer number (14450938920).

Almost surely, 2^169666421079 is an apocalyptic number.

169666421079 is a deficient number, since it is larger than the sum of its proper divisors (61548601641).

169666421079 is a wasteful number, since it uses less digits than its factorization.

169666421079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5179790.

The product of its (nonzero) digits is 5878656, while the sum is 57.

The spelling of 169666421079 in words is "one hundred sixty-nine billion, six hundred sixty-six million, four hundred twenty-one thousand, seventy-nine".