165438780641604 has 36 divisors (see below), whose sum is σ = 418238718994096. Its totient is φ = 55140161879088.

The previous prime is 165438780641573. The next prime is 165438780641647. The reversal of 165438780641604 is 406146087834561.

165438780641604 is a `hidden beast` number, since 1 + 6 + 5 + 438 + 7 + 80 + 64 + 1 + 60 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253767214 + ... + 254418309.

Almost surely, 2^{165438780641604} is an apocalyptic number.

It is an amenable number.

165438780641604 is an abundant number, since it is smaller than the sum of its proper divisors (252799938352492).

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

165438780641604 is a wasteful number, since it uses less digits than its factorization.

165438780641604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508194576 (or 508194571 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 63.

The spelling of 165438780641604 in words is "one hundred sixty-five trillion, four hundred thirty-eight billion, seven hundred eighty million, six hundred forty-one thousand, six hundred four".