165709453834 has 16 divisors (see below), whose sum is σ = 249523480296. Its totient is φ = 82535544000.

The previous prime is 165709453831. The next prime is 165709453859. The reversal of 165709453834 is 438354907561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 159882421609 + 5827032225 = 399853^2 + 76335^2 .

It is not an unprimeable number, because it can be changed into a prime (165709453831) 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, 424684 + ... + 715384.

Almost surely, 2^165709453834 is an apocalyptic number.

165709453834 is a deficient number, since it is larger than the sum of its proper divisors (83814026462).

165709453834 is a wasteful number, since it uses less digits than its factorization.

165709453834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291801.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 165709453834 in words is "one hundred sixty-five billion, seven hundred nine million, four hundred fifty-three thousand, eight hundred thirty-four".