166666500650505 has 8 divisors (see below), whose sum is σ = 266666401040832. Its totient is φ = 88888800346928.

The previous prime is 166666500650459. The next prime is 166666500650509. The reversal of 166666500650505 is 505056005666661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166666500650505 - 2⁹ = 166666500649993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166666500650509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555550021669 + ... + 5555550021698.

It is an arithmetic number, because the mean of its divisors is an integer number (33333300130104).

Almost surely, 2^{166666500650505} is an apocalyptic number.

166666500650505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166666500650505 is a deficient number, since it is larger than the sum of its proper divisors (99999900390327).

166666500650505 is a wasteful number, since it uses less digits than its factorization.

166666500650505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111100043375.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 166666500650505 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, five hundred million, six hundred fifty thousand, five hundred five".