165221132235527 has 2 divisors, whose sum is σ = 165221132235528. Its totient is φ = 165221132235526.

The previous prime is 165221132235499. The next prime is 165221132235539. The reversal of 165221132235527 is 725532231122561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165221132235527 - 2¹⁰ = 165221132234503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165221132235587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82610566117763 + 82610566117764.

It is an arithmetic number, because the mean of its divisors is an integer number (82610566117764).

Almost surely, 2^{165221132235527} is an apocalyptic number.

165221132235527 is a deficient number, since it is larger than the sum of its proper divisors (1).

165221132235527 is an equidigital number, since it uses as much as digits as its factorization.

165221132235527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512000, while the sum is 47.

The spelling of 165221132235527 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred thirty-five thousand, five hundred twenty-seven".