165537145073 has 4 divisors (see below), whose sum is σ = 166745445540. Its totient is φ = 164328844608.

The previous prime is 165537144991. The next prime is 165537145079. The reversal of 165537145073 is 370541735561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79176392689 + 86360752384 = 281383^2 + 293872^2 .

It is a cyclic number.

It is not a de Polignac number, because 165537145073 - 2¹⁶ = 165537079537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165537145079) 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, 604150028 + ... + 604150301.

It is an arithmetic number, because the mean of its divisors is an integer number (41686361385).

Almost surely, 2^165537145073 is an apocalyptic number.

It is an amenable number.

165537145073 is a deficient number, since it is larger than the sum of its proper divisors (1208300467).

165537145073 is a wasteful number, since it uses less digits than its factorization.

165537145073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208300466.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The spelling of 165537145073 in words is "one hundred sixty-five billion, five hundred thirty-seven million, one hundred forty-five thousand, seventy-three".