165216977 has 2 divisors, whose sum is σ = 165216978. Its totient is φ = 165216976.

The previous prime is 165216959. The next prime is 165217001. The reversal of 165216977 is 779612561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84198976 + 81018001 = 9176^2 + 9001^2 .

It is a cyclic number.

It is not a de Polignac number, because 165216977 - 2⁸ = 165216721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165216907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82608488 + 82608489.

It is an arithmetic number, because the mean of its divisors is an integer number (82608489).

Almost surely, 2^165216977 is an apocalyptic number.

It is an amenable number.

165216977 is a deficient number, since it is larger than the sum of its proper divisors (1).

165216977 is an equidigital number, since it uses as much as digits as its factorization.

165216977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 165216977 is about 12853.6756221713. The cubic root of 165216977 is about 548.7209695053.

The spelling of 165216977 in words is "one hundred sixty-five million, two hundred sixteen thousand, nine hundred seventy-seven".