166722122172355 has 4 divisors (see below), whose sum is σ = 200066546606832. Its totient is φ = 133377697737880.

The previous prime is 166722122172343. The next prime is 166722122172377. The reversal of 166722122172355 is 553271221227661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166722122172355 - 2¹⁷ = 166722122041283 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16672212217231 + ... + 16672212217240.

It is an arithmetic number, because the mean of its divisors is an integer number (50016636651708).

Almost surely, 2^{166722122172355} is an apocalyptic number.

166722122172355 is a deficient number, since it is larger than the sum of its proper divisors (33344424434477).

166722122172355 is an equidigital number, since it uses as much as digits as its factorization.

166722122172355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33344424434476.

The product of its digits is 4233600, while the sum is 52.

The spelling of 166722122172355 in words is "one hundred sixty-six trillion, seven hundred twenty-two billion, one hundred twenty-two million, one hundred seventy-two thousand, three hundred fifty-five".