166612601 has 4 divisors (see below), whose sum is σ = 166664100. Its totient is φ = 166561104.

The previous prime is 166612583. The next prime is 166612613. The reversal of 166612601 is 106216661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34339600 + 132273001 = 5860^2 + 11501^2 .

It is a cyclic number.

It is not a de Polignac number, because 166612601 - 2²² = 162418297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166612681) 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, 20546 + ... + 27483.

It is an arithmetic number, because the mean of its divisors is an integer number (41666025).

Almost surely, 2^166612601 is an apocalyptic number.

It is an amenable number.

166612601 is a deficient number, since it is larger than the sum of its proper divisors (51499).

166612601 is an equidigital number, since it uses as much as digits as its factorization.

166612601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51498.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 166612601 is about 12907.8503632479. The cubic root of 166612601 is about 550.2616947474.

The spelling of 166612601 in words is "one hundred sixty-six million, six hundred twelve thousand, six hundred one".