166501442 has 4 divisors (see below), whose sum is σ = 249752166. Its totient is φ = 83250720.

The previous prime is 166501411. The next prime is 166501459. The reversal of 166501442 is 244105661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244105661 = 4903 ⋅49787.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 1661521 = 12839^2 + 1289^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41625359 + ... + 41625362.

Almost surely, 2^166501442 is an apocalyptic number.

166501442 is a deficient number, since it is larger than the sum of its proper divisors (83250724).

166501442 is an equidigital number, since it uses as much as digits as its factorization.

166501442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83250723.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 166501442 is about 12903.5437768080. The cubic root of 166501442 is about 550.1392947463.

The spelling of 166501442 in words is "one hundred sixty-six million, five hundred one thousand, four hundred forty-two".