165501656661 has 8 divisors (see below), whose sum is σ = 240729682464. Its totient is φ = 100304034320.

The previous prime is 165501656597. The next prime is 165501656729. The reversal of 165501656661 is 166656105561.

165501656661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165501656661 - 2⁶ = 165501656597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165501656661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165501656161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2507600826 + ... + 2507600891.

It is an arithmetic number, because the mean of its divisors is an integer number (30091210308).

Almost surely, 2^165501656661 is an apocalyptic number.

165501656661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165501656661 is a deficient number, since it is larger than the sum of its proper divisors (75228025803).

165501656661 is a wasteful number, since it uses less digits than its factorization.

165501656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015201731.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 165501656661 in words is "one hundred sixty-five billion, five hundred one million, six hundred fifty-six thousand, six hundred sixty-one".