166236820066 has 8 divisors (see below), whose sum is σ = 249626566080. Its totient is φ = 83027964708.

The previous prime is 166236820063. The next prime is 166236820091. The reversal of 166236820066 is 660028632661.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 166236819998 and 166236820025.

It is not an unprimeable number, because it can be changed into a prime (166236820063) 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, 45220366 + ... + 45224041.

It is an arithmetic number, because the mean of its divisors is an integer number (31203320760).

Almost surely, 2^166236820066 is an apocalyptic number.

166236820066 is a deficient number, since it is larger than the sum of its proper divisors (83389746014).

166236820066 is an equidigital number, since it uses as much as digits as its factorization.

166236820066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90445328.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 166236820066 in words is "one hundred sixty-six billion, two hundred thirty-six million, eight hundred twenty thousand, sixty-six".