166561432 has 8 divisors (see below), whose sum is σ = 312302700. Its totient is φ = 83280712.

The previous prime is 166561411. The next prime is 166561433. The reversal of 166561432 is 234165661.

166561432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166561433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410082 + ... + 10410097.

Almost surely, 2^166561432 is an apocalyptic number.

It is an amenable number.

166561432 is a deficient number, since it is larger than the sum of its proper divisors (145741268).

166561432 is a wasteful number, since it uses less digits than its factorization.

166561432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20820185 (or 20820181 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 166561432 is about 12905.8681226797. The cubic root of 166561432 is about 550.2053580250.

The spelling of 166561432 in words is "one hundred sixty-six million, five hundred sixty-one thousand, four hundred thirty-two".