166642071 has 8 divisors (see below), whose sum is σ = 227356800. Its totient is φ = 108511032.

The previous prime is 166642067. The next prime is 166642079. The reversal of 166642071 is 170246661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166642071 - 2² = 166642067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166642079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645771 + ... + 646028.

It is an arithmetic number, because the mean of its divisors is an integer number (28419600).

Almost surely, 2^166642071 is an apocalyptic number.

166642071 is a deficient number, since it is larger than the sum of its proper divisors (60714729).

166642071 is a wasteful number, since it uses less digits than its factorization.

166642071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291845.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 166642071 is about 12908.9918661373. The cubic root of 166642071 is about 550.2941357833.

The spelling of 166642071 in words is "one hundred sixty-six million, six hundred forty-two thousand, seventy-one".