165221132231442 has 48 divisors (see below), whose sum is σ = 393767437123872. Its totient is φ = 46054671001920.

The previous prime is 165221132231431. The next prime is 165221132231459. The reversal of 165221132231442 is 244132231122561.

It is a self number, because there is not a number n which added to its sum of digits gives 165221132231442.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6853361608 + ... + 6853385715.

It is an arithmetic number, because the mean of its divisors is an integer number (8203488273414).

Almost surely, 2^{165221132231442} is an apocalyptic number.

165221132231442 is an abundant number, since it is smaller than the sum of its proper divisors (228546304892430).

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

165221132231442 is a wasteful number, since it uses less digits than its factorization.

165221132231442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13706747383 (or 13706747376 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The spelling of 165221132231442 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred thirty-one thousand, four hundred forty-two".