165080621 has 2 divisors, whose sum is σ = 165080622. Its totient is φ = 165080620.

The previous prime is 165080581. The next prime is 165080639. The reversal of 165080621 is 126080561.

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., 164737225 + 343396 = 12835^2 + 586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165080621 is a prime.

It is a super-2 number, since 2×165080621² = 54503222859491282, which contains 22 as substring.

It is a Chen prime.

It is equal to p_9243191 and since 165080621 and 9243191 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165085621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82540310 + 82540311.

It is an arithmetic number, because the mean of its divisors is an integer number (82540311).

Almost surely, 2^165080621 is an apocalyptic number.

It is an amenable number.

165080621 is a deficient number, since it is larger than the sum of its proper divisors (1).

165080621 is an equidigital number, since it uses as much as digits as its factorization.

165080621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 165080621 is about 12848.3703635909. The cubic root of 165080621 is about 548.5699721299.

The spelling of 165080621 in words is "one hundred sixty-five million, eighty thousand, six hundred twenty-one".