165651060661 has 2 divisors, whose sum is σ = 165651060662. Its totient is φ = 165651060660.

The previous prime is 165651060649. The next prime is 165651060727. The reversal of 165651060661 is 166060156561.

165651060661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117823995025 + 47827065636 = 343255^2 + 218694^2 .

It is a cyclic number.

It is not a de Polignac number, because 165651060661 - 2¹¹ = 165651058613 is a prime.

It is a super-2 number, since 2×165651060661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165651060761) 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 as a sum of consecutive naturals, namely, 82825530330 + 82825530331.

It is an arithmetic number, because the mean of its divisors is an integer number (82825530331).

Almost surely, 2^165651060661 is an apocalyptic number.

It is an amenable number.

165651060661 is a deficient number, since it is larger than the sum of its proper divisors (1).

165651060661 is an equidigital number, since it uses as much as digits as its factorization.

165651060661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

It can be divided in two parts, 1656510 and 60661, that added together give a palindrome (1717171).

The spelling of 165651060661 in words is "one hundred sixty-five billion, six hundred fifty-one million, sixty thousand, six hundred sixty-one".