166145494 has 4 divisors (see below), whose sum is σ = 249218244. Its totient is φ = 83072746.

The previous prime is 166145477. The next prime is 166145527. The reversal of 166145494 is 494541661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 494541661 = 47 ⋅10522163.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41536372 + ... + 41536375.

It is an arithmetic number, because the mean of its divisors is an integer number (62304561).

Almost surely, 2^166145494 is an apocalyptic number.

166145494 is a deficient number, since it is larger than the sum of its proper divisors (83072750).

166145494 is an equidigital number, since it uses as much as digits as its factorization.

166145494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83072749.

The product of its digits is 103680, while the sum is 40.

The square root of 166145494 is about 12889.7437523017. The cubic root of 166145494 is about 549.7469844500.

The spelling of 166145494 in words is "one hundred sixty-six million, one hundred forty-five thousand, four hundred ninety-four".