166640732 has 12 divisors (see below), whose sum is σ = 308775600. Its totient is φ = 78419136.

The previous prime is 166640723. The next prime is 166640737. The reversal of 166640732 is 237046661.

It is a super-2 number, since 2×166640732² = 55538267122991648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166640692 and 166640701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640737) 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 3 ways as a sum of consecutive naturals, for example, 1225232 + ... + 1225367.

It is an arithmetic number, because the mean of its divisors is an integer number (25731300).

Almost surely, 2^166640732 is an apocalyptic number.

It is an amenable number.

166640732 is a deficient number, since it is larger than the sum of its proper divisors (142134868).

166640732 is a wasteful number, since it uses less digits than its factorization.

166640732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450620 (or 2450618 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 166640732 is about 12908.9400029592. The cubic root of 166640732 is about 550.2926618742.

The spelling of 166640732 in words is "one hundred sixty-six million, six hundred forty thousand, seven hundred thirty-two".