166741640 has 32 divisors (see below), whose sum is σ = 404029080. Its totient is φ = 61565952.

The previous prime is 166741639. The next prime is 166741643. The reversal of 166741640 is 46147661.

It can be written as a sum of positive squares in 4 ways, for example, as 95609284 + 71132356 = 9778^2 + 8434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166741640.

It is not an unprimeable number, because it can be changed into a prime (166741643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159809 + ... + 160848.

Almost surely, 2^166741640 is an apocalyptic number.

166741640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166741640 is an abundant number, since it is smaller than the sum of its proper divisors (237287440).

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

166741640 is a wasteful number, since it uses less digits than its factorization.

166741640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320681 (or 320677 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 166741640 is about 12912.8478655949. The cubic root of 166741640 is about 550.4037146095.

The spelling of 166741640 in words is "one hundred sixty-six million, seven hundred forty-one thousand, six hundred forty".