165530223412 has 6 divisors (see below), whose sum is σ = 289677890978. Its totient is φ = 82765111704.

The previous prime is 165530223407. The next prime is 165530223421. The reversal of 165530223412 is 214322035561.

165530223412 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 158956905636 + 6573317776 = 398694^2 + 81076^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20691277923 + ... + 20691277930.

Almost surely, 2^165530223412 is an apocalyptic number.

It is an amenable number.

165530223412 is a deficient number, since it is larger than the sum of its proper divisors (124147667566).

165530223412 is a wasteful number, since it uses less digits than its factorization.

165530223412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41382555857 (or 41382555855 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 165530223412 its reverse (214322035561), we get a palindrome (379852258973).

The spelling of 165530223412 in words is "one hundred sixty-five billion, five hundred thirty million, two hundred twenty-three thousand, four hundred twelve".