166443615 has 48 divisors (see below), whose sum is σ = 321441120. Its totient is φ = 79107840.

The previous prime is 166443601. The next prime is 166443623. The reversal of 166443615 is 516344661.

It is a happy number.

166443615 is a `hidden beast` number, since 1 + 6 + 644 + 3 + 6 + 1 + 5 = 666.

It is not a de Polignac number, because 166443615 - 2⁶ = 166443551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166443615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12060 + ... + 21870.

It is an arithmetic number, because the mean of its divisors is an integer number (6696690).

Almost surely, 2^166443615 is an apocalyptic number.

166443615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166443615 is a deficient number, since it is larger than the sum of its proper divisors (154997505).

166443615 is a wasteful number, since it uses less digits than its factorization.

166443615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864 (or 9861 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 166443615 is about 12901.3028411862. The cubic root of 166443615 is about 550.0755984238.

The spelling of 166443615 in words is "one hundred sixty-six million, four hundred forty-three thousand, six hundred fifteen".