165628061 has 2 divisors, whose sum is σ = 165628062. Its totient is φ = 165628060.

The previous prime is 165628051. The next prime is 165628063. The reversal of 165628061 is 160826561.

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., 165611161 + 16900 = 12869^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 165628061 - 2¹⁰ = 165627037 is a prime.

Together with 165628063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165628063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82814030 + 82814031.

It is an arithmetic number, because the mean of its divisors is an integer number (82814031).

Almost surely, 2^165628061 is an apocalyptic number.

It is an amenable number.

165628061 is a deficient number, since it is larger than the sum of its proper divisors (1).

165628061 is an equidigital number, since it uses as much as digits as its factorization.

165628061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 165628061 is about 12869.6565999253. The cubic root of 165628061 is about 549.1756919138.

The spelling of 165628061 in words is "one hundred sixty-five million, six hundred twenty-eight thousand, sixty-one".