166396680 has 384 divisors, whose sum is σ = 636854400. Its totient is φ = 38817792.

The previous prime is 166396639. The next prime is 166396709. The reversal of 166396680 is 86693661.

166396680 is a `hidden beast` number, since 1 + 6 + 639 + 6 + 6 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 3139534 + ... + 3139586.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^166396680 is an apocalyptic number.

166396680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166396680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318427200).

166396680 is an abundant number, since it is smaller than the sum of its proper divisors (470457720).

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

166396680 is a wasteful number, since it uses less digits than its factorization.

166396680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 166396680 is about 12899.4837105987. The cubic root of 166396680 is about 550.0238887696.

The spelling of 166396680 in words is "one hundred sixty-six million, three hundred ninety-six thousand, six hundred eighty".