165510649 has 2 divisors, whose sum is σ = 165510650. Its totient is φ = 165510648.

The previous prime is 165510617. The next prime is 165510661. The reversal of 165510649 is 946015561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148962025 + 16548624 = 12205^2 + 4068^2 .

It is a cyclic number.

It is not a de Polignac number, because 165510649 - 2⁵ = 165510617 is a prime.

It is not a weakly prime, because it can be changed into another prime (165510049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82755324 + 82755325.

It is an arithmetic number, because the mean of its divisors is an integer number (82755325).

Almost surely, 2^165510649 is an apocalyptic number.

It is an amenable number.

165510649 is a deficient number, since it is larger than the sum of its proper divisors (1).

165510649 is an equidigital number, since it uses as much as digits as its factorization.

165510649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 165510649 is about 12865.0942087495. The cubic root of 165510649 is about 549.0458929367.

The spelling of 165510649 in words is "one hundred sixty-five million, five hundred ten thousand, six hundred forty-nine".