165613901 has 2 divisors, whose sum is σ = 165613902. Its totient is φ = 165613900.

The previous prime is 165613871. The next prime is 165613907. The reversal of 165613901 is 109316561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165122500 + 491401 = 12850^2 + 701^2 .

It is a cyclic number.

It is not a de Polignac number, because 165613901 - 2¹⁰ = 165612877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165613907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82806950 + 82806951.

It is an arithmetic number, because the mean of its divisors is an integer number (82806951).

Almost surely, 2^165613901 is an apocalyptic number.

It is an amenable number.

165613901 is a deficient number, since it is larger than the sum of its proper divisors (1).

165613901 is an equidigital number, since it uses as much as digits as its factorization.

165613901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 165613901 is about 12869.1064569379. The cubic root of 165613901 is about 549.1600412860.

The spelling of 165613901 in words is "one hundred sixty-five million, six hundred thirteen thousand, nine hundred one".