166621070 has 96 divisors (see below), whose sum is σ = 400878720. Its totient is φ = 49170240.

The previous prime is 166621069. The next prime is 166621093. The reversal of 166621070 is 70126661.

166621070 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101597 + ... + 103223.

It is an arithmetic number, because the mean of its divisors is an integer number (4175820).

Almost surely, 2^166621070 is an apocalyptic number.

166621070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166621070 is an abundant number, since it is smaller than the sum of its proper divisors (234257650).

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

166621070 is a wasteful number, since it uses less digits than its factorization.

166621070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 166621070 is about 12908.1784152529. The cubic root of 166621070 is about 550.2710179464.

It can be divided in two parts, 166 and 621070, that multiplied together give a triangular number (103097620 = T₁₄₃₅₉).

The spelling of 166621070 in words is "one hundred sixty-six million, six hundred twenty-one thousand, seventy".