164556909 has 12 divisors (see below), whose sum is σ = 259301952. Its totient is φ = 99731400.

The previous prime is 164556901. The next prime is 164556943. The reversal of 164556909 is 909655461.

It is a happy number.

164556909 is a `hidden beast` number, since 1 + 6 + 4 + 556 + 90 + 9 = 666.

It is not a de Polignac number, because 164556909 - 2³ = 164556901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164556901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 830997 + ... + 831194.

It is an arithmetic number, because the mean of its divisors is an integer number (21608496).

Almost surely, 2^164556909 is an apocalyptic number.

It is an amenable number.

164556909 is a deficient number, since it is larger than the sum of its proper divisors (94745043).

164556909 is a wasteful number, since it uses less digits than its factorization.

164556909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662208 (or 1662205 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 164556909 is about 12827.9736903378. The cubic root of 164556909 is about 547.9892517916.

The spelling of 164556909 in words is "one hundred sixty-four million, five hundred fifty-six thousand, nine hundred nine".