165664436 has 24 divisors (see below), whose sum is σ = 339412416. Its totient is φ = 69266880.

The previous prime is 165664427. The next prime is 165664451. The reversal of 165664436 is 634466561.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 165664393 and 165664402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71006 + ... + 73301.

It is an arithmetic number, because the mean of its divisors is an integer number (14142184).

Almost surely, 2^165664436 is an apocalyptic number.

It is an amenable number.

165664436 is an abundant number, since it is smaller than the sum of its proper divisors (173747980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165664436 is a wasteful number, since it uses less digits than its factorization.

165664436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144359 (or 144357 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 165664436 is about 12871.0697302128. The cubic root of 165664436 is about 549.2158920334.

The spelling of 165664436 in words is "one hundred sixty-five million, six hundred sixty-four thousand, four hundred thirty-six".