166543427 has 4 divisors (see below), whose sum is σ = 166569960. Its totient is φ = 166516896.

The previous prime is 166543423. The next prime is 166543451. The reversal of 166543427 is 724345661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 166543427 - 2² = 166543423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166543423) 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, 2024 + ... + 18362.

It is an arithmetic number, because the mean of its divisors is an integer number (41642490).

Almost surely, 2^166543427 is an apocalyptic number.

166543427 is a deficient number, since it is larger than the sum of its proper divisors (26533).

166543427 is a wasteful number, since it uses less digits than its factorization.

166543427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26532.

The product of its digits is 120960, while the sum is 38.

The square root of 166543427 is about 12905.1705529218. The cubic root of 166543427 is about 550.1855318977.

The spelling of 166543427 in words is "one hundred sixty-six million, five hundred forty-three thousand, four hundred twenty-seven".