165605126506 has 4 divisors (see below), whose sum is σ = 248407689762. Its totient is φ = 82802563252.

The previous prime is 165605126497. The next prime is 165605126549. The reversal of 165605126506 is 605621506561.

165605126506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 100422441025 + 65182685481 = 316895^2 + 255309^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41401281625 + ... + 41401281628.

Almost surely, 2^165605126506 is an apocalyptic number.

165605126506 is a deficient number, since it is larger than the sum of its proper divisors (82802563256).

165605126506 is an equidigital number, since it uses as much as digits as its factorization.

165605126506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82802563255.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 165605126506 in words is "one hundred sixty-five billion, six hundred five million, one hundred twenty-six thousand, five hundred six".