166642157 has 8 divisors (see below), whose sum is σ = 186019680. Its totient is φ = 147969360.

The previous prime is 166642129. The next prime is 166642169. The reversal of 166642157 is 751246661.

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

It is not a de Polignac number, because 166642157 - 2¹² = 166638061 is a prime.

It is a super-2 number, since 2×166642157² = 55539216979225298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166642157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166642127) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 175682 + ... + 176627.

It is an arithmetic number, because the mean of its divisors is an integer number (23252460).

Almost surely, 2^166642157 is an apocalyptic number.

It is an amenable number.

166642157 is a deficient number, since it is larger than the sum of its proper divisors (19377523).

166642157 is a wasteful number, since it uses less digits than its factorization.

166642157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352363.

The product of its digits is 60480, while the sum is 38.

The square root of 166642157 is about 12908.9951971484. The cubic root of 166642157 is about 550.2942304479.

The spelling of 166642157 in words is "one hundred sixty-six million, six hundred forty-two thousand, one hundred fifty-seven".