165618052566 has 16 divisors (see below), whose sum is σ = 331240238784. Its totient is φ = 55205328584.

The previous prime is 165618052553. The next prime is 165618052597. The reversal of 165618052566 is 665250816561.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 652141 + ... + 869783.

It is an arithmetic number, because the mean of its divisors is an integer number (20702514924).

Almost surely, 2^165618052566 is an apocalyptic number.

165618052566 is an abundant number, since it is smaller than the sum of its proper divisors (165622186218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165618052566 is a wasteful number, since it uses less digits than its factorization.

165618052566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344475.

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 165618052566 in words is "one hundred sixty-five billion, six hundred eighteen million, fifty-two thousand, five hundred sixty-six".