165117759911501 has 2 divisors, whose sum is σ = 165117759911502. Its totient is φ = 165117759911500.

The previous prime is 165117759911497. The next prime is 165117759911549. The reversal of 165117759911501 is 105119957711561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92680553801476 + 72437206110025 = 9627074^2 + 8511005^2 .

It is a cyclic number.

It is not a de Polignac number, because 165117759911501 - 2² = 165117759911497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165117759913501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82558879955750 + 82558879955751.

It is an arithmetic number, because the mean of its divisors is an integer number (82558879955751).

Almost surely, 2^{165117759911501} is an apocalyptic number.

It is an amenable number.

165117759911501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165117759911501 is an equidigital number, since it uses as much as digits as its factorization.

165117759911501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2976750, while the sum is 59.

The spelling of 165117759911501 in words is "one hundred sixty-five trillion, one hundred seventeen billion, seven hundred fifty-nine million, nine hundred eleven thousand, five hundred one".