66601620166 has 8 divisors (see below), whose sum is σ = 100054029240. Its totient is φ = 33250277088.

The previous prime is 66601620149. The next prime is 66601620167. The reversal of 66601620166 is 66102610666.

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

It is a super-2 number, since 2×66601620166² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601620167) 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, 25264851 + ... + 25267486.

It is an arithmetic number, because the mean of its divisors is an integer number (12506753655).

Almost surely, 2^66601620166 is an apocalyptic number.

66601620166 is a deficient number, since it is larger than the sum of its proper divisors (33452409074).

66601620166 is a wasteful number, since it uses less digits than its factorization.

66601620166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50532998.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 66601620166 in words is "sixty-six billion, six hundred one million, six hundred twenty thousand, one hundred sixty-six".