660849745169 has 4 divisors (see below), whose sum is σ = 661123845360. Its totient is φ = 660575644980.

The previous prime is 660849745141. The next prime is 660849745177. The reversal of 660849745169 is 961547948066.

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 not a de Polignac number, because 660849745169 - 2⁸ = 660849744913 is a prime.

It is a super-2 number, since 2×660849745169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660849745109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137046479 + ... + 137051300.

It is an arithmetic number, because the mean of its divisors is an integer number (165280961340).

Almost surely, 2^660849745169 is an apocalyptic number.

It is an amenable number.

660849745169 is a deficient number, since it is larger than the sum of its proper divisors (274100191).

660849745169 is a wasteful number, since it uses less digits than its factorization.

660849745169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274100190.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 660849745169 in words is "six hundred sixty billion, eight hundred forty-nine million, seven hundred forty-five thousand, one hundred sixty-nine".