166311942 has 16 divisors (see below), whose sum is σ = 347086080. Its totient is φ = 53026952.

The previous prime is 166311941. The next prime is 166311979. The reversal of 166311942 is 249113661.

It is a super-2 number, since 2×166311942² = 55319324103622728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) 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 not an unprimeable number, because it can be changed into a prime (166311941) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 602442 + ... + 602717.

It is an arithmetic number, because the mean of its divisors is an integer number (21692880).

Almost surely, 2^166311942 is an apocalyptic number.

166311942 is an abundant number, since it is smaller than the sum of its proper divisors (180774138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166311942 is a wasteful number, since it uses less digits than its factorization.

166311942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205187.

The product of its digits is 7776, while the sum is 33.

The square root of 166311942 is about 12896.1987422651. The cubic root of 166311942 is about 549.9305058201.

The spelling of 166311942 in words is "one hundred sixty-six million, three hundred eleven thousand, nine hundred forty-two".