165709453835 has 4 divisors (see below), whose sum is σ = 198851344608. Its totient is φ = 132567563064.

The previous prime is 165709453831. The next prime is 165709453859. The reversal of 165709453835 is 538354907561.

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

It is a cyclic number.

It is not a de Polignac number, because 165709453835 - 2² = 165709453831 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165709453831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16570945379 + ... + 16570945388.

It is an arithmetic number, because the mean of its divisors is an integer number (49712836152).

Almost surely, 2^165709453835 is an apocalyptic number.

165709453835 is a deficient number, since it is larger than the sum of its proper divisors (33141890773).

165709453835 is an equidigital number, since it uses as much as digits as its factorization.

165709453835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33141890772.

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 165709453835 in words is "one hundred sixty-five billion, seven hundred nine million, four hundred fifty-three thousand, eight hundred thirty-five".