166126397 has 4 divisors (see below), whose sum is σ = 175898556. Its totient is φ = 156354240.

The previous prime is 166126391. The next prime is 166126403. The reversal of 166126397 is 793621661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (166126391) and next prime (166126403).

It can be written as a sum of positive squares in 2 ways, for example, as 99720196 + 66406201 = 9986^2 + 8149^2 .

It is a cyclic number.

It is not a de Polignac number, because 166126397 - 2⁶ = 166126333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166126391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4886054 + ... + 4886087.

It is an arithmetic number, because the mean of its divisors is an integer number (43974639).

Almost surely, 2^166126397 is an apocalyptic number.

166126397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166126397 is a deficient number, since it is larger than the sum of its proper divisors (9772159).

166126397 is an equidigital number, since it uses as much as digits as its factorization.

166126397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9772158.

The product of its digits is 81648, while the sum is 41.

The square root of 166126397 is about 12889.0029482501. The cubic root of 166126397 is about 549.7259207422.

The spelling of 166126397 in words is "one hundred sixty-six million, one hundred twenty-six thousand, three hundred ninety-seven".