166422021110645 has 8 divisors (see below), whose sum is σ = 201765254460504. Its totient is φ = 131765064136704.

The previous prime is 166422021110641. The next prime is 166422021110663. The reversal of 166422021110645 is 546011120224661.

It can be written as a sum of positive squares in 4 ways, for example, as 34818036263761 + 131603984846884 = 5900681^2 + 11471878^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166422021110645 - 2² = 166422021110641 is a prime.

It is a super-2 number, since 2×166422021110645² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166422021110641) 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, 171569093444 + ... + 171569094413.

It is an arithmetic number, because the mean of its divisors is an integer number (25220656807563).

Almost surely, 2^{166422021110645} is an apocalyptic number.

It is an amenable number.

166422021110645 is a deficient number, since it is larger than the sum of its proper divisors (35343233349859).

166422021110645 is an equidigital number, since it uses as much as digits as its factorization.

166422021110645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343138187959.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 166422021110645 in words is "one hundred sixty-six trillion, four hundred twenty-two billion, twenty-one million, one hundred ten thousand, six hundred forty-five".