166042823 has 4 divisors (see below), whose sum is σ = 169904328. Its totient is φ = 162181320.

The previous prime is 166042813. The next prime is 166042831. The reversal of 166042823 is 328240661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166042823 - 2⁶ = 166042759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166042823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166042813) 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, 1930688 + ... + 1930773.

It is an arithmetic number, because the mean of its divisors is an integer number (42476082).

Almost surely, 2^166042823 is an apocalyptic number.

166042823 is a deficient number, since it is larger than the sum of its proper divisors (3861505).

166042823 is an equidigital number, since it uses as much as digits as its factorization.

166042823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861504.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 166042823 is about 12885.7604742599. The cubic root of 166042823 is about 549.6337208644.

The spelling of 166042823 in words is "one hundred sixty-six million, forty-two thousand, eight hundred twenty-three".