165428777 has 2 divisors, whose sum is σ = 165428778. Its totient is φ = 165428776.

The previous prime is 165428773. The next prime is 165428779. The reversal of 165428777 is 777824561.

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., 146627881 + 18800896 = 12109^2 + 4336^2 .

It is a cyclic number.

It is not a de Polignac number, because 165428777 - 2² = 165428773 is a prime.

Together with 165428779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165428771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82714388 + 82714389.

It is an arithmetic number, because the mean of its divisors is an integer number (82714389).

Almost surely, 2^165428777 is an apocalyptic number.

It is an amenable number.

165428777 is a deficient number, since it is larger than the sum of its proper divisors (1).

165428777 is an equidigital number, since it uses as much as digits as its factorization.

165428777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 47.

The square root of 165428777 is about 12861.9118718797. The cubic root of 165428777 is about 548.9553471025.

The spelling of 165428777 in words is "one hundred sixty-five million, four hundred twenty-eight thousand, seven hundred seventy-seven".