165435966523 has 2 divisors, whose sum is σ = 165435966524. Its totient is φ = 165435966522.

The previous prime is 165435966503. The next prime is 165435966533. The reversal of 165435966523 is 325669534561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165435966523 - 2¹⁷ = 165435835451 is a prime.

It is not a weakly prime, because it can be changed into another prime (165435966503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82717983261 + 82717983262.

It is an arithmetic number, because the mean of its divisors is an integer number (82717983262).

Almost surely, 2^165435966523 is an apocalyptic number.

165435966523 is a deficient number, since it is larger than the sum of its proper divisors (1).

165435966523 is an equidigital number, since it uses as much as digits as its factorization.

165435966523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496000, while the sum is 55.

The spelling of 165435966523 in words is "one hundred sixty-five billion, four hundred thirty-five million, nine hundred sixty-six thousand, five hundred twenty-three".