669138568573 has 8 divisors (see below), whose sum is σ = 708566899392. Its totient is φ = 629717708736.

The previous prime is 669138568559. The next prime is 669138568601. The reversal of 669138568573 is 375865831966.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669138568573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669138568499 and 669138568508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669138568523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1682815 + ... + 2042092.

It is an arithmetic number, because the mean of its divisors is an integer number (88570862424).

Almost surely, 2^669138568573 is an apocalyptic number.

It is an amenable number.

669138568573 is a deficient number, since it is larger than the sum of its proper divisors (39428330819).

669138568573 is a wasteful number, since it uses less digits than its factorization.

669138568573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735491.

The product of its digits is 195955200, while the sum is 67.

The spelling of 669138568573 in words is "six hundred sixty-nine billion, one hundred thirty-eight million, five hundred sixty-eight thousand, five hundred seventy-three".