165552403 has 2 divisors, whose sum is σ = 165552404. Its totient is φ = 165552402.

The previous prime is 165552389. The next prime is 165552427. The reversal of 165552403 is 304255561.

It is a weak prime.

It is an emirp because it is prime and its reverse (304255561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165552403 - 2²¹ = 163455251 is a prime.

It is not a weakly prime, because it can be changed into another prime (165552463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82776201 + 82776202.

It is an arithmetic number, because the mean of its divisors is an integer number (82776202).

Almost surely, 2^165552403 is an apocalyptic number.

165552403 is a deficient number, since it is larger than the sum of its proper divisors (1).

165552403 is an equidigital number, since it uses as much as digits as its factorization.

165552403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 165552403 is about 12866.7168695048. The cubic root of 165552403 is about 549.0920590190.

The spelling of 165552403 in words is "one hundred sixty-five million, five hundred fifty-two thousand, four hundred three".