166685016690 has 48 divisors (see below), whose sum is σ = 439849433088. Its totient is φ = 43785913248.

The previous prime is 166685016653. The next prime is 166685016703. The reversal of 166685016690 is 96610586661.

166685016690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166685016690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13815282 + ... + 13827341.

It is an arithmetic number, because the mean of its divisors is an integer number (9163529856).

Almost surely, 2^166685016690 is an apocalyptic number.

166685016690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166685016690 is an abundant number, since it is smaller than the sum of its proper divisors (273164416398).

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

166685016690 is a wasteful number, since it uses less digits than its factorization.

166685016690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27642703 (or 27642700 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 166685016690 in words is "one hundred sixty-six billion, six hundred eighty-five million, sixteen thousand, six hundred ninety".