166988061 has 20 divisors (see below), whose sum is σ = 258056700. Its totient is φ = 107485056.

The previous prime is 166988057. The next prime is 166988069. The reversal of 166988061 is 160889661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28196100 + 138791961 = 5310^2 + 11781^2 .

It is not a de Polignac number, because 166988061 - 2² = 166988057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166987998 and 166988016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166988069) 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 19 ways as a sum of consecutive naturals, for example, 33196 + ... + 37893.

It is an arithmetic number, because the mean of its divisors is an integer number (12902835).

Almost surely, 2^166988061 is an apocalyptic number.

It is an amenable number.

166988061 is a deficient number, since it is larger than the sum of its proper divisors (91068639).

166988061 is an equidigital number, since it uses as much as digits as its factorization.

166988061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71130 (or 71121 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 166988061 is about 12922.3860412851. The cubic root of 166988061 is about 550.6747212478.

The spelling of 166988061 in words is "one hundred sixty-six million, nine hundred eighty-eight thousand, sixty-one".