165135137973 has 8 divisors (see below), whose sum is σ = 237117121248. Its totient is φ = 101621623344.

The previous prime is 165135137939. The next prime is 165135137983. The reversal of 165135137973 is 379731531561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165135137973 - 2¹⁶ = 165135072437 is a prime.

It is a super-2 number, since 2×165135137973² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165135137903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117117115 + ... + 2117117192.

It is an arithmetic number, because the mean of its divisors is an integer number (29639640156).

Almost surely, 2^165135137973 is an apocalyptic number.

165135137973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165135137973 is a deficient number, since it is larger than the sum of its proper divisors (71981983275).

165135137973 is a wasteful number, since it uses less digits than its factorization.

165135137973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234234323.

The product of its digits is 1786050, while the sum is 51.

The spelling of 165135137973 in words is "one hundred sixty-five billion, one hundred thirty-five million, one hundred thirty-seven thousand, nine hundred seventy-three".