669744447965 has 8 divisors (see below), whose sum is σ = 803826501720. Its totient is φ = 535706782272.

The previous prime is 669744447947. The next prime is 669744448007. The reversal of 669744447965 is 569744447966.

It can be written as a sum of positive squares in 4 ways, for example, as 22302136921 + 647442311044 = 149339^2 + 804638^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 669744447965 - 2⁶ = 669744447901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11063810 + ... + 11124179.

It is an arithmetic number, because the mean of its divisors is an integer number (100478312715).

Almost surely, 2^669744447965 is an apocalyptic number.

It is an amenable number.

669744447965 is a deficient number, since it is larger than the sum of its proper divisors (134082053755).

669744447965 is a wasteful number, since it uses less digits than its factorization.

669744447965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22194031.

The product of its digits is 1097349120, while the sum is 71.

Subtracting from 669744447965 its reverse (569744447966), we obtain a palindrome (99999999999).

The spelling of 669744447965 in words is "six hundred sixty-nine billion, seven hundred forty-four million, four hundred forty-seven thousand, nine hundred sixty-five".