166605161565994 has 8 divisors (see below), whose sum is σ = 251008657514208. Its totient is φ = 82935609061260.

The previous prime is 166605161565991. The next prime is 166605161566007. The reversal of 166605161565994 is 499565161506661.

166605161565994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (166605161565991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183485860302 + ... + 183485861209.

It is an arithmetic number, because the mean of its divisors is an integer number (31376082189276).

Almost surely, 2^{166605161565994} is an apocalyptic number.

166605161565994 is a deficient number, since it is larger than the sum of its proper divisors (84403495948214).

166605161565994 is a wasteful number, since it uses less digits than its factorization.

166605161565994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366971721740.

The product of its (nonzero) digits is 314928000, while the sum is 70.

The spelling of 166605161565994 in words is "one hundred sixty-six trillion, six hundred five billion, one hundred sixty-one million, five hundred sixty-five thousand, nine hundred ninety-four".