166731180723 has 12 divisors (see below), whose sum is σ = 241516181400. Its totient is φ = 110839234176.

The previous prime is 166731180713. The next prime is 166731180743. The reversal of 166731180723 is 327081137661.

It is not a de Polignac number, because 166731180723 - 2¹² = 166731176627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166731180703) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 26237173 + ... + 26243526.

It is an arithmetic number, because the mean of its divisors is an integer number (20126348450).

Almost surely, 2^166731180723 is an apocalyptic number.

166731180723 is a deficient number, since it is larger than the sum of its proper divisors (74785000677).

166731180723 is a wasteful number, since it uses less digits than its factorization.

166731180723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52481058 (or 52481055 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 166731180723 in words is "one hundred sixty-six billion, seven hundred thirty-one million, one hundred eighty thousand, seven hundred twenty-three".