166438873 has 4 divisors (see below), whose sum is σ = 166661248. Its totient is φ = 166216500.

The previous prime is 166438871. The next prime is 166438889. The reversal of 166438873 is 378834661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166438873 - 2¹ = 166438871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166438871) 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, 110061 + ... + 111562.

It is an arithmetic number, because the mean of its divisors is an integer number (41665312).

Almost surely, 2^166438873 is an apocalyptic number.

It is an amenable number.

166438873 is a deficient number, since it is larger than the sum of its proper divisors (222375).

166438873 is an equidigital number, since it uses as much as digits as its factorization.

166438873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222374.

The product of its digits is 580608, while the sum is 46.

The square root of 166438873 is about 12901.1190599886. The cubic root of 166438873 is about 550.0703744660.

The spelling of 166438873 in words is "one hundred sixty-six million, four hundred thirty-eight thousand, eight hundred seventy-three".