165663138 has 16 divisors (see below), whose sum is σ = 342751680. Its totient is φ = 53316816.

The previous prime is 165663077. The next prime is 165663143. The reversal of 165663138 is 831366561.

165663138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 165663096 and 165663105.

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, 475870 + ... + 476217.

It is an arithmetic number, because the mean of its divisors is an integer number (21421980).

Almost surely, 2^165663138 is an apocalyptic number.

165663138 is an abundant number, since it is smaller than the sum of its proper divisors (177088542).

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

165663138 is a wasteful number, since it uses less digits than its factorization.

165663138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952121.

The product of its digits is 77760, while the sum is 39.

The square root of 165663138 is about 12871.0193069547. The cubic root of 165663138 is about 549.2144576397.

The spelling of 165663138 in words is "one hundred sixty-five million, six hundred sixty-three thousand, one hundred thirty-eight".