166665767799 has 8 divisors (see below), whose sum is σ = 223584343552. Its totient is φ = 110428851960.

The previous prime is 166665767797. The next prime is 166665767819. The reversal of 166665767799 is 997767566661.

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

It is not a de Polignac number, because 166665767799 - 2¹ = 166665767797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166665767799.

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 7 ways as a sum of consecutive naturals, for example, 170414407 + ... + 170415384.

It is an arithmetic number, because the mean of its divisors is an integer number (27948042944).

Almost surely, 2^166665767799 is an apocalyptic number.

166665767799 is a deficient number, since it is larger than the sum of its proper divisors (56918575753).

166665767799 is a wasteful number, since it uses less digits than its factorization.

166665767799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340829957.

The product of its digits is 1080203040, while the sum is 75.

The spelling of 166665767799 in words is "one hundred sixty-six billion, six hundred sixty-five million, seven hundred sixty-seven thousand, seven hundred ninety-nine".