165035072321 has 16 divisors (see below), whose sum is σ = 197339729664. Its totient is φ = 134945452224.

The previous prime is 165035072281. The next prime is 165035072353. The reversal of 165035072321 is 123270530561.

It is a cyclic number.

It is not a de Polignac number, because 165035072321 - 2²² = 165030878017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165035072821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1314026 + ... + 1434131.

It is an arithmetic number, because the mean of its divisors is an integer number (12333733104).

Almost surely, 2^165035072321 is an apocalyptic number.

It is an amenable number.

165035072321 is a deficient number, since it is larger than the sum of its proper divisors (32304657343).

165035072321 is a wasteful number, since it uses less digits than its factorization.

165035072321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748560.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 165035072321 in words is "one hundred sixty-five billion, thirty-five million, seventy-two thousand, three hundred twenty-one".