166998805 has 4 divisors (see below), whose sum is σ = 200398572. Its totient is φ = 133599040.

The previous prime is 166998779. The next prime is 166998817. The reversal of 166998805 is 508899661.

166998805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508899661 = 499 ⋅1019839.

It can be written as a sum of positive squares in 2 ways, for example, as 36650916 + 130347889 = 6054^2 + 11417^2 .

It is not a de Polignac number, because 166998805 - 2⁷ = 166998677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16699876 + ... + 16699885.

It is an arithmetic number, because the mean of its divisors is an integer number (50099643).

Almost surely, 2^166998805 is an apocalyptic number.

It is an amenable number.

166998805 is a deficient number, since it is larger than the sum of its proper divisors (33399767).

166998805 is an equidigital number, since it uses as much as digits as its factorization.

166998805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33399766.

The product of its (nonzero) digits is 933120, while the sum is 52.

The square root of 166998805 is about 12922.8017472992. The cubic root of 166998805 is about 550.6865311187.

The spelling of 166998805 in words is "one hundred sixty-six million, nine hundred ninety-eight thousand, eight hundred five".