165116623140221 has 8 divisors (see below), whose sum is σ = 165858581187264. Its totient is φ = 164374792918560.

The previous prime is 165116623140191. The next prime is 165116623140229. The reversal of 165116623140221 is 122041326611561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165116623140221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165116623140229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29366600 + ... + 34534481.

It is an arithmetic number, because the mean of its divisors is an integer number (20732322648408).

Almost surely, 2^{165116623140221} is an apocalyptic number.

It is an amenable number.

165116623140221 is a deficient number, since it is larger than the sum of its proper divisors (741958047043).

165116623140221 is a wasteful number, since it uses less digits than its factorization.

165116623140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63912691.

The product of its (nonzero) digits is 103680, while the sum is 41.

Adding to 165116623140221 its reverse (122041326611561), we get a palindrome (287157949751782).

The spelling of 165116623140221 in words is "one hundred sixty-five trillion, one hundred sixteen billion, six hundred twenty-three million, one hundred forty thousand, two hundred twenty-one".