165658601 has 2 divisors, whose sum is σ = 165658602. Its totient is φ = 165658600.

The previous prime is 165658589. The next prime is 165658609. The reversal of 165658601 is 106856561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89113600 + 76545001 = 9440^2 + 8749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165658601 is a prime.

It is not a weakly prime, because it can be changed into another prime (165658609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82829300 + 82829301.

It is an arithmetic number, because the mean of its divisors is an integer number (82829301).

Almost surely, 2^165658601 is an apocalyptic number.

It is an amenable number.

165658601 is a deficient number, since it is larger than the sum of its proper divisors (1).

165658601 is an equidigital number, since it uses as much as digits as its factorization.

165658601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 165658601 is about 12870.8430570806. The cubic root of 165658601 is about 549.2094438332.

The spelling of 165658601 in words is "one hundred sixty-five million, six hundred fifty-eight thousand, six hundred one".