166497858 has 12 divisors (see below), whose sum is σ = 360745398. Its totient is φ = 55499280.

The previous prime is 166497841. The next prime is 166497871. The reversal of 166497858 is 858794661.

166497858 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 88228449 + 78269409 = 9393^2 + 8847^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4624923 + ... + 4624958.

Almost surely, 2^166497858 is an apocalyptic number.

166497858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166497858 is an abundant number, since it is smaller than the sum of its proper divisors (194247540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166497858 is a wasteful number, since it uses less digits than its factorization.

166497858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9249889 (or 9249886 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 166497858 is about 12903.4048994829. The cubic root of 166497858 is about 550.1353474064.

The spelling of 166497858 in words is "one hundred sixty-six million, four hundred ninety-seven thousand, eight hundred fifty-eight".