165887977 has 2 divisors, whose sum is σ = 165887978. Its totient is φ = 165887976.

The previous prime is 165887941. The next prime is 165888011. The reversal of 165887977 is 779788561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153363456 + 12524521 = 12384^2 + 3539^2 .

It is an emirp because it is prime and its reverse (779788561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165887977 - 2⁷ = 165887849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165887177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82943988 + 82943989.

It is an arithmetic number, because the mean of its divisors is an integer number (82943989).

Almost surely, 2^165887977 is an apocalyptic number.

It is an amenable number.

165887977 is a deficient number, since it is larger than the sum of its proper divisors (1).

165887977 is an equidigital number, since it uses as much as digits as its factorization.

165887977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 58.

The square root of 165887977 is about 12879.7506575244. The cubic root of 165887977 is about 549.4628110317.

The spelling of 165887977 in words is "one hundred sixty-five million, eight hundred eighty-seven thousand, nine hundred seventy-seven".