165221363 has 2 divisors, whose sum is σ = 165221364. Its totient is φ = 165221362.

The previous prime is 165221341. The next prime is 165221387. The reversal of 165221363 is 363122561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165221363 - 2⁸ = 165221107 is a prime.

It is not a weakly prime, because it can be changed into another prime (165221333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82610681 + 82610682.

It is an arithmetic number, because the mean of its divisors is an integer number (82610682).

Almost surely, 2^165221363 is an apocalyptic number.

165221363 is a deficient number, since it is larger than the sum of its proper divisors (1).

165221363 is an equidigital number, since it uses as much as digits as its factorization.

165221363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 165221363 is about 12853.8462337154. The cubic root of 165221363 is about 548.7258250775.

The spelling of 165221363 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred sixty-three".