165632501 has 2 divisors, whose sum is σ = 165632502. Its totient is φ = 165632500.

The previous prime is 165632491. The next prime is 165632503. The reversal of 165632501 is 105236561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133980625 + 31651876 = 11575^2 + 5626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165632501 is a prime.

Together with 165632503, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165632503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82816250 + 82816251.

It is an arithmetic number, because the mean of its divisors is an integer number (82816251).

Almost surely, 2^165632501 is an apocalyptic number.

It is an amenable number.

165632501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165632501 is an equidigital number, since it uses as much as digits as its factorization.

165632501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 165632501 is about 12869.8290975444. The cubic root of 165632501 is about 549.1805991304.

The spelling of 165632501 in words is "one hundred sixty-five million, six hundred thirty-two thousand, five hundred one".