165546554137 has 4 divisors (see below), whose sum is σ = 165577906996. Its totient is φ = 165515201280.

The previous prime is 165546554111. The next prime is 165546554171. The reversal of 165546554137 is 731455645561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731455645561 = 71 ⋅10302192191.

It can be written as a sum of positive squares in 2 ways, for example, as 13336554256 + 152209999881 = 115484^2 + 390141^2 .

It is a cyclic number.

It is not a de Polignac number, because 165546554137 - 2¹¹ = 165546552089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165546654137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15668508 + ... + 15679069.

It is an arithmetic number, because the mean of its divisors is an integer number (41394476749).

Almost surely, 2^165546554137 is an apocalyptic number.

It is an amenable number.

165546554137 is a deficient number, since it is larger than the sum of its proper divisors (31352859).

165546554137 is an equidigital number, since it uses as much as digits as its factorization.

165546554137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31352858.

The product of its digits is 7560000, while the sum is 52.

The spelling of 165546554137 in words is "one hundred sixty-five billion, five hundred forty-six million, five hundred fifty-four thousand, one hundred thirty-seven".