166665767798 has 32 divisors (see below), whose sum is σ = 269266874400. Its totient is φ = 77079873024.

The previous prime is 166665767797. The next prime is 166665767819. The reversal of 166665767798 is 897767566661.

It is a super-3 number, since 3×166665767798³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665767797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8730608 + ... + 8749676.

It is an arithmetic number, because the mean of its divisors is an integer number (8414589825).

Almost surely, 2^166665767798 is an apocalyptic number.

166665767798 is a deficient number, since it is larger than the sum of its proper divisors (102601106602).

166665767798 is a wasteful number, since it uses less digits than its factorization.

166665767798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23504.

The product of its digits is 960180480, while the sum is 74.

The spelling of 166665767798 in words is "one hundred sixty-six billion, six hundred sixty-five million, seven hundred sixty-seven thousand, seven hundred ninety-eight".