166428930193 has 4 divisors (see below), whose sum is σ = 166443427620. Its totient is φ = 166414432768.

The previous prime is 166428930047. The next prime is 166428930211. The reversal of 166428930193 is 391039824661.

It is a happy number.

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 106036850689 + 60392079504 = 325633^2 + 245748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166428930193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166428930193.

It is not an unprimeable number, because it can be changed into a prime (166428934193) 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, 7231480 + ... + 7254457.

It is an arithmetic number, because the mean of its divisors is an integer number (41610856905).

Almost surely, 2^166428930193 is an apocalyptic number.

It is an amenable number.

166428930193 is a deficient number, since it is larger than the sum of its proper divisors (14497427).

166428930193 is a wasteful number, since it uses less digits than its factorization.

166428930193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14497426.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 166428930193 in words is "one hundred sixty-six billion, four hundred twenty-eight million, nine hundred thirty thousand, one hundred ninety-three".