166530394799 has 16 divisors (see below), whose sum is σ = 178810022400. Its totient is φ = 154631415744.

The previous prime is 166530394769. The next prime is 166530394801. The reversal of 166530394799 is 997493035661.

It is a cyclic number.

It is not a de Polignac number, because 166530394799 - 2³² = 162235427503 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 (166530394739) 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, 199277 + ... + 610550.

It is an arithmetic number, because the mean of its divisors is an integer number (11175626400).

Almost surely, 2^166530394799 is an apocalyptic number.

166530394799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

166530394799 is a deficient number, since it is larger than the sum of its proper divisors (12279627601).

166530394799 is a wasteful number, since it uses less digits than its factorization.

166530394799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810062.

The product of its (nonzero) digits is 33067440, while the sum is 62.

The spelling of 166530394799 in words is "one hundred sixty-six billion, five hundred thirty million, three hundred ninety-four thousand, seven hundred ninety-nine".