165751452217 has 24 divisors (see below), whose sum is σ = 196581881664. Its totient is φ = 138646433376.

The previous prime is 165751452203. The next prime is 165751452241. The reversal of 165751452217 is 712254157561.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-165751452217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165751452617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 659863 + ... + 875740.

It is an arithmetic number, because the mean of its divisors is an integer number (8190911736).

Almost surely, 2^165751452217 is an apocalyptic number.

It is an amenable number.

165751452217 is a deficient number, since it is larger than the sum of its proper divisors (30830429447).

165751452217 is a wasteful number, since it uses less digits than its factorization.

165751452217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535677 (or 1535658 counting only the distinct ones).

The product of its digits is 588000, while the sum is 46.

The spelling of 165751452217 in words is "one hundred sixty-five billion, seven hundred fifty-one million, four hundred fifty-two thousand, two hundred seventeen".