166666500650502 has 40 divisors (see below), whose sum is σ = 379578654509472. Its totient is φ = 54644754308400.

The previous prime is 166666500650459. The next prime is 166666500650509. The reversal of 166666500650502 is 205056005666661.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 19 ways as a sum of consecutive naturals, for example, 8432822574 + ... + 8432842337.

Almost surely, 2^{166666500650502} is an apocalyptic number.

166666500650502 is an abundant number, since it is smaller than the sum of its proper divisors (212912153858970).

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

166666500650502 is a wasteful number, since it uses less digits than its factorization.

166666500650502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16865664986 (or 16865664977 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 54.

The spelling of 166666500650502 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, five hundred million, six hundred fifty thousand, five hundred two".