166066541 has 4 divisors (see below), whose sum is σ = 166135392. Its totient is φ = 165997692.

The previous prime is 166066529. The next prime is 166066553. The reversal of 166066541 is 145660661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (166066529) and next prime (166066553).

It is a cyclic number.

It is not a de Polignac number, because 166066541 - 2⁶ = 166066477 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 (166066501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30671 + ... + 35676.

It is an arithmetic number, because the mean of its divisors is an integer number (41533848).

Almost surely, 2^166066541 is an apocalyptic number.

It is an amenable number.

166066541 is a deficient number, since it is larger than the sum of its proper divisors (68851).

166066541 is an equidigital number, since it uses as much as digits as its factorization.

166066541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68850.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166066541 is about 12886.6807596060. The cubic root of 166066541 is about 549.6598900010.

The spelling of 166066541 in words is "one hundred sixty-six million, sixty-six thousand, five hundred forty-one".