166040646 has 8 divisors (see below), whose sum is σ = 332081304. Its totient is φ = 55346880.

The previous prime is 166040629. The next prime is 166040647. The reversal of 166040646 is 646040661.

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

166040646 is an admirable number.

It is a super-2 number, since 2×166040646² = 55138992248194632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166040647) 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 3 ways as a sum of consecutive naturals, for example, 13836715 + ... + 13836726.

It is an arithmetic number, because the mean of its divisors is an integer number (41510163).

Almost surely, 2^166040646 is an apocalyptic number.

166040646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166040646 is a wasteful number, since it uses less digits than its factorization.

166040646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27673446.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 166040646 is about 12885.6760008934. The cubic root of 166040646 is about 549.6313187575.

The spelling of 166040646 in words is "one hundred sixty-six million, forty thousand, six hundred forty-six".