165218082025 has 12 divisors (see below), whose sum is σ = 208342803600. Its totient is φ = 129934219280.

The previous prime is 165218081993. The next prime is 165218082049. The reversal of 165218082025 is 520280812561.

It is not a de Polignac number, because 165218082025 - 2⁵ = 165218081993 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56004655 + ... + 56007604.

It is an arithmetic number, because the mean of its divisors is an integer number (17361900300).

Almost surely, 2^165218082025 is an apocalyptic number.

It is an amenable number.

165218082025 is a deficient number, since it is larger than the sum of its proper divisors (43124721575).

165218082025 is a wasteful number, since it uses less digits than its factorization.

165218082025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112012328 (or 112012323 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

Adding to 165218082025 its reverse (520280812561), we get a palindrome (685498894586).

The spelling of 165218082025 in words is "one hundred sixty-five billion, two hundred eighteen million, eighty-two thousand, twenty-five".