169636243609 has 4 divisors (see below), whose sum is σ = 193869992704. Its totient is φ = 145402494516.

The previous prime is 169636243597. The next prime is 169636243633. The reversal of 169636243609 is 906342636961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169636243609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 169636243609.

It is not an unprimeable number, because it can be changed into a prime (169636243649) 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, 12116874537 + ... + 12116874550.

It is an arithmetic number, because the mean of its divisors is an integer number (48467498176).

Almost surely, 2^169636243609 is an apocalyptic number.

It is an amenable number.

169636243609 is a deficient number, since it is larger than the sum of its proper divisors (24233749095).

169636243609 is an equidigital number, since it uses as much as digits as its factorization.

169636243609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24233749094.

The product of its (nonzero) digits is 7558272, while the sum is 55.

The spelling of 169636243609 in words is "one hundred sixty-nine billion, six hundred thirty-six million, two hundred forty-three thousand, six hundred nine".