166217823405 has 48 divisors (see below), whose sum is σ = 307429187520. Its totient is φ = 82833249024.

The previous prime is 166217823389. The next prime is 166217823433. The reversal of 166217823405 is 504328712661.

166217823405 is a `hidden beast` number, since 1 + 6 + 6 + 217 + 8 + 23 + 405 = 666.

It is not a de Polignac number, because 166217823405 - 2⁴ = 166217823389 is a prime.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1269139 + ... + 1393968.

It is an arithmetic number, because the mean of its divisors is an integer number (6404774740).

Almost surely, 2^166217823405 is an apocalyptic number.

166217823405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166217823405 is a deficient number, since it is larger than the sum of its proper divisors (141211364115).

166217823405 is a wasteful number, since it uses less digits than its factorization.

166217823405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663210 (or 2663207 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 166217823405 in words is "one hundred sixty-six billion, two hundred seventeen million, eight hundred twenty-three thousand, four hundred five".