165045612645121 has 16 divisors (see below), whose sum is σ = 188202653939664. Its totient is φ = 143383588890624.

The previous prime is 165045612645091. The next prime is 165045612645167. The reversal of 165045612645121 is 121546216540561.

It can be written as a sum of positive squares in 8 ways, for example, as 264463347600 + 164781149297521 = 514260^2 + 12836711^2 .

It is not a de Polignac number, because 165045612645121 - 2⁹ = 165045612644609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165045612645821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4461106 + ... + 18708091.

It is an arithmetic number, because the mean of its divisors is an integer number (11762665871229).

Almost surely, 2^{165045612645121} is an apocalyptic number.

It is an amenable number.

165045612645121 is a deficient number, since it is larger than the sum of its proper divisors (23157041294543).

165045612645121 is a wasteful number, since it uses less digits than its factorization.

165045612645121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23201460.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 165045612645121 in words is "one hundred sixty-five trillion, forty-five billion, six hundred twelve million, six hundred forty-five thousand, one hundred twenty-one".