166572771616 has 24 divisors (see below), whose sum is σ = 328104815724. Its totient is φ = 83244564480.

The previous prime is 166572771613. The next prime is 166572771653. The reversal of 166572771616 is 616177275661.

It can be written as a sum of positive squares in 2 ways, for example, as 165652256016 + 920515600 = 407004^2 + 30340^2 .

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166572771613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1242145 + ... + 1369696.

Almost surely, 2^166572771616 is an apocalyptic number.

166572771616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166572771616 is a deficient number, since it is larger than the sum of its proper divisors (161532044108).

166572771616 is a wasteful number, since it uses less digits than its factorization.

166572771616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613844 (or 2613836 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 55.

The spelling of 166572771616 in words is "one hundred sixty-six billion, five hundred seventy-two million, seven hundred seventy-one thousand, six hundred sixteen".