165638012 has 6 divisors (see below), whose sum is σ = 289866528. Its totient is φ = 82819004.

The previous prime is 165638009. The next prime is 165638017. The reversal of 165638012 is 210836561.

It is a happy number.

It is a super-3 number, since 3×165638012³ (a number of 26 digits) contains 333 as substring.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 165638012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165638017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20704748 + ... + 20704755.

It is an arithmetic number, because the mean of its divisors is an integer number (48311088).

Almost surely, 2^165638012 is an apocalyptic number.

It is an amenable number.

165638012 is a deficient number, since it is larger than the sum of its proper divisors (124228516).

165638012 is a wasteful number, since it uses less digits than its factorization.

165638012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41409507 (or 41409505 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 165638012 is about 12870.0432011707. The cubic root of 165638012 is about 549.1866899252.

The spelling of 165638012 in words is "one hundred sixty-five million, six hundred thirty-eight thousand, twelve".