166543537 has 4 divisors (see below), whose sum is σ = 166620160. Its totient is φ = 166466916.

The previous prime is 166543523. The next prime is 166543541. The reversal of 166543537 is 735345661.

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 a cyclic number.

It is not a de Polignac number, because 166543537 - 2¹¹ = 166541489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166543537.

It is not an unprimeable number, because it can be changed into a prime (166543547) 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, 34953 + ... + 39430.

It is an arithmetic number, because the mean of its divisors is an integer number (41655040).

Almost surely, 2^166543537 is an apocalyptic number.

It is an amenable number.

166543537 is a deficient number, since it is larger than the sum of its proper divisors (76623).

166543537 is an equidigital number, since it uses as much as digits as its factorization.

166543537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76622.

The product of its digits is 226800, while the sum is 40.

The square root of 166543537 is about 12905.1748147788. The cubic root of 166543537 is about 550.1856530281.

The spelling of 166543537 in words is "one hundred sixty-six million, five hundred forty-three thousand, five hundred thirty-seven".