166868505 has 40 divisors (see below), whose sum is σ = 308799744. Its totient is φ = 86119200.

The previous prime is 166868497. The next prime is 166868561. The reversal of 166868505 is 505868661.

166868505 is a `hidden beast` number, since 1 + 66 + 86 + 8 + 505 = 666.

166868505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166868505 - 2³ = 166868497 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5910 + ... + 19200.

Almost surely, 2^166868505 is an apocalyptic number.

166868505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166868505 is a deficient number, since it is larger than the sum of its proper divisors (141931239).

166868505 is a wasteful number, since it uses less digits than its factorization.

166868505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13339 (or 13330 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 166868505 is about 12917.7592871210. The cubic root of 166868505 is about 550.5432703628.

The spelling of 166868505 in words is "one hundred sixty-six million, eight hundred sixty-eight thousand, five hundred five".