166722748574121 has 24 divisors (see below), whose sum is σ = 248760099661320. Its totient is φ = 107519372891136.

The previous prime is 166722748574113. The next prime is 166722748574143. The reversal of 166722748574121 is 121475847227661.

166722748574121 is a `hidden beast` number, since 1 + 6 + 6 + 7 + 2 + 2 + 7 + 48 + 574 + 12 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 81046176579225 + 85676571994896 = 9002565^2 + 9256164^2 .

It is not a de Polignac number, because 166722748574121 - 2³ = 166722748574113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166722748574191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1446962376 + ... + 1447077593.

It is an arithmetic number, because the mean of its divisors is an integer number (10365004152555).

Almost surely, 2^{166722748574121} is an apocalyptic number.

It is an amenable number.

166722748574121 is a deficient number, since it is larger than the sum of its proper divisors (82037351087199).

166722748574121 is a wasteful number, since it uses less digits than its factorization.

166722748574121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894040185 (or 2894040182 counting only the distinct ones).

The product of its digits is 63221760, while the sum is 63.

The spelling of 166722748574121 in words is "one hundred sixty-six trillion, seven hundred twenty-two billion, seven hundred forty-eight million, five hundred seventy-four thousand, one hundred twenty-one".