166636845672121 has 8 divisors (see below), whose sum is σ = 186013223076384. Its totient is φ = 147965063809920.

The previous prime is 166636845672103. The next prime is 166636845672131. The reversal of 166636845672121 is 121276548636661.

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 166636845672121 - 2¹³ = 166636845663929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166636845672131) 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, 176148885016 + ... + 176148885961.

It is an arithmetic number, because the mean of its divisors is an integer number (23251652884548).

Almost surely, 2^{166636845672121} is an apocalyptic number.

166636845672121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166636845672121 is a deficient number, since it is larger than the sum of its proper divisors (19376377404263).

166636845672121 is a wasteful number, since it uses less digits than its factorization.

166636845672121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352297771031.

The product of its digits is 104509440, while the sum is 64.

The spelling of 166636845672121 in words is "one hundred sixty-six trillion, six hundred thirty-six billion, eight hundred forty-five million, six hundred seventy-two thousand, one hundred twenty-one".