166564541 has 12 divisors (see below), whose sum is σ = 196761600. Its totient is φ = 139772880.

The previous prime is 166564537. The next prime is 166564543. The reversal of 166564541 is 145465661.

It is a happy number.

It is not a de Polignac number, because 166564541 - 2² = 166564537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166564495 and 166564504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166564543) 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 11 ways as a sum of consecutive naturals, for example, 42941 + ... + 46658.

It is an arithmetic number, because the mean of its divisors is an integer number (16396800).

Almost surely, 2^166564541 is an apocalyptic number.

166564541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166564541 is a deficient number, since it is larger than the sum of its proper divisors (30197059).

166564541 is a wasteful number, since it uses less digits than its factorization.

166564541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89636 (or 89623 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 166564541 is about 12905.9885712021. The cubic root of 166564541 is about 550.2087813421.

The spelling of 166564541 in words is "one hundred sixty-six million, five hundred sixty-four thousand, five hundred forty-one".