165664447 has 12 divisors (see below), whose sum is σ = 179780664. Its totient is φ = 152586720.

The previous prime is 165664427. The next prime is 165664451. The reversal of 165664447 is 744466561.

It is not a de Polignac number, because 165664447 - 2⁷ = 165664319 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 (165664427) 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, 110968 + ... + 112450.

It is an arithmetic number, because the mean of its divisors is an integer number (14981722).

Almost surely, 2^165664447 is an apocalyptic number.

165664447 is a deficient number, since it is larger than the sum of its proper divisors (14116217).

165664447 is a wasteful number, since it uses less digits than its factorization.

165664447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170 (or 2157 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The square root of 165664447 is about 12871.0701575277. The cubic root of 165664447 is about 549.2159041893.

The spelling of 165664447 in words is "one hundred sixty-five million, six hundred sixty-four thousand, four hundred forty-seven".