166223878 has 4 divisors (see below), whose sum is σ = 249335820. Its totient is φ = 83111938.

The previous prime is 166223857. The next prime is 166223879. The reversal of 166223878 is 878322661.

166223878 is digitally balanced in base 3, 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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166223879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41555968 + ... + 41555971.

It is an arithmetic number, because the mean of its divisors is an integer number (62333955).

Almost surely, 2^166223878 is an apocalyptic number.

166223878 is a deficient number, since it is larger than the sum of its proper divisors (83111942).

166223878 is an equidigital number, since it uses as much as digits as its factorization.

166223878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83111941.

The product of its digits is 193536, while the sum is 43.

The square root of 166223878 is about 12892.7839507222. The cubic root of 166223878 is about 549.8334239351.

The spelling of 166223878 in words is "one hundred sixty-six million, two hundred twenty-three thousand, eight hundred seventy-eight".