165010621 has 2 divisors, whose sum is σ = 165010622. Its totient is φ = 165010620.

The previous prime is 165010597. The next prime is 165010627. The reversal of 165010621 is 126010561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157226521 + 7784100 = 12539^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 165010621 - 2²¹ = 162913469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165010592 and 165010601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165010627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82505310 + 82505311.

It is an arithmetic number, because the mean of its divisors is an integer number (82505311).

Almost surely, 2^165010621 is an apocalyptic number.

It is an amenable number.

165010621 is a deficient number, since it is larger than the sum of its proper divisors (1).

165010621 is an equidigital number, since it uses as much as digits as its factorization.

165010621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 165010621 is about 12845.6459938767. The cubic root of 165010621 is about 548.4924235019.

The spelling of 165010621 in words is "one hundred sixty-five million, ten thousand, six hundred twenty-one".