669744447903 has 24 divisors (see below), whose sum is σ = 981123770016. Its totient is φ = 440167392000.

The previous prime is 669744447901. The next prime is 669744447907. The reversal of 669744447903 is 309744447966.

669744447903 is a `hidden beast` number, since 6 + 69 + 7 + 44 + 447 + 90 + 3 = 666.

It is not a de Polignac number, because 669744447903 - 2¹ = 669744447901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669744447901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8010451 + ... + 8093627.

It is an arithmetic number, because the mean of its divisors is an integer number (40880157084).

Almost surely, 2^669744447903 is an apocalyptic number.

669744447903 is a deficient number, since it is larger than the sum of its proper divisors (311379322113).

669744447903 is a wasteful number, since it uses less digits than its factorization.

669744447903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95855 (or 95852 counting only the distinct ones).

The product of its (nonzero) digits is 109734912, while the sum is 63.

Adding to 669744447903 its sum of digits (63), we get a palindrome (669744447966).

The spelling of 669744447903 in words is "six hundred sixty-nine billion, seven hundred forty-four million, four hundred forty-seven thousand, nine hundred three".