166666500650503 has 8 divisors (see below), whose sum is σ = 190577696434208. Its totient is φ = 142780728789504.

The previous prime is 166666500650459. The next prime is 166666500650509. The reversal of 166666500650503 is 305056005666661.

It is a happy number.

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 166666500650503 - 2⁹ = 166666500649991 is a prime.

It is a Duffinian number.

It is a congruent 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, 6355966626 + ... + 6355992847.

It is an arithmetic number, because the mean of its divisors is an integer number (23822212054276).

Almost surely, 2^{166666500650503} is an apocalyptic number.

166666500650503 is a deficient number, since it is larger than the sum of its proper divisors (23911195783705).

166666500650503 is a wasteful number, since it uses less digits than its factorization.

166666500650503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12711961353.

The product of its (nonzero) digits is 17496000, while the sum is 55.

The spelling of 166666500650503 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, five hundred million, six hundred fifty thousand, five hundred three".