165564977 has 2 divisors, whose sum is σ = 165564978. Its totient is φ = 165564976.

The previous prime is 165564967. The next prime is 165564983. The reversal of 165564977 is 779465561.

165564977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145709041 + 19855936 = 12071^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 165564977 - 2¹⁰ = 165563953 is a prime.

It is not a weakly prime, because it can be changed into another prime (165564967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82782488 + 82782489.

It is an arithmetic number, because the mean of its divisors is an integer number (82782489).

Almost surely, 2^165564977 is an apocalyptic number.

It is an amenable number.

165564977 is a deficient number, since it is larger than the sum of its proper divisors (1).

165564977 is an equidigital number, since it uses as much as digits as its factorization.

165564977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 50.

The square root of 165564977 is about 12867.2054852637. The cubic root of 165564977 is about 549.1059601738.

The spelling of 165564977 in words is "one hundred sixty-five million, five hundred sixty-four thousand, nine hundred seventy-seven".