166722748573647 has 32 divisors (see below), whose sum is σ = 263971956902400. Its totient is φ = 91579744545408.

The previous prime is 166722748573639. The next prime is 166722748573651. The reversal of 166722748573647 is 746375847227661.

It is not a de Polignac number, because 166722748573647 - 2³ = 166722748573639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166722748573247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 602867872 + ... + 603144357.

It is an arithmetic number, because the mean of its divisors is an integer number (8249123653200).

Almost surely, 2^{166722748573647} is an apocalyptic number.

166722748573647 is a deficient number, since it is larger than the sum of its proper divisors (97249208328753).

166722748573647 is a wasteful number, since it uses less digits than its factorization.

166722748573647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206012495.

The product of its digits is 3982970880, while the sum is 75.

The spelling of 166722748573647 in words is "one hundred sixty-six trillion, seven hundred twenty-two billion, seven hundred forty-eight million, five hundred seventy-three thousand, six hundred forty-seven".