165606656079 has 4 divisors (see below), whose sum is σ = 220808874776. Its totient is φ = 110404437384.

The previous prime is 165606656027. The next prime is 165606656101. The reversal of 165606656079 is 970656606561.

165606656079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165606656079 - 2¹⁶ = 165606590543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165606656009) 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 3 ways as a sum of consecutive naturals, for example, 27601109344 + ... + 27601109349.

It is an arithmetic number, because the mean of its divisors is an integer number (55202218694).

Almost surely, 2^165606656079 is an apocalyptic number.

165606656079 is a deficient number, since it is larger than the sum of its proper divisors (55202218697).

165606656079 is an equidigital number, since it uses as much as digits as its factorization.

165606656079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55202218696.

The product of its (nonzero) digits is 12247200, while the sum is 57.

The spelling of 165606656079 in words is "one hundred sixty-five billion, six hundred six million, six hundred fifty-six thousand, seventy-nine".