165508477 has 2 divisors, whose sum is σ = 165508478. Its totient is φ = 165508476.

The previous prime is 165508457. The next prime is 165508489. The reversal of 165508477 is 774805561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151265401 + 14243076 = 12299^2 + 3774^2 .

It is an emirp because it is prime and its reverse (774805561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165508477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165508417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82754238 + 82754239.

It is an arithmetic number, because the mean of its divisors is an integer number (82754239).

Almost surely, 2^165508477 is an apocalyptic number.

It is an amenable number.

165508477 is a deficient number, since it is larger than the sum of its proper divisors (1).

165508477 is an equidigital number, since it uses as much as digits as its factorization.

165508477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 165508477 is about 12865.0097940110. The cubic root of 165508477 is about 549.0434912123.

The spelling of 165508477 in words is "one hundred sixty-five million, five hundred eight thousand, four hundred seventy-seven".