165156615065651 has 16 divisors (see below), whose sum is σ = 188229023445600. Its totient is φ = 143529756384000.

The previous prime is 165156615065597. The next prime is 165156615065693. The reversal of 165156615065651 is 156560516651561.

It is a cyclic number.

It is not a de Polignac number, because 165156615065651 - 2¹⁴ = 165156615049267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165156615065051) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2562999146 + ... + 2563063583.

It is an arithmetic number, because the mean of its divisors is an integer number (11764313965350).

Almost surely, 2^{165156615065651} is an apocalyptic number.

165156615065651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165156615065651 is a deficient number, since it is larger than the sum of its proper divisors (23072408379949).

165156615065651 is a wasteful number, since it uses less digits than its factorization.

165156615065651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126062870.

The product of its (nonzero) digits is 24300000, while the sum is 59.

The spelling of 165156615065651 in words is "one hundred sixty-five trillion, one hundred fifty-six billion, six hundred fifteen million, sixty-five thousand, six hundred fifty-one".