669616571 has 8 divisors (see below), whose sum is σ = 721331520. Its totient is φ = 617931072.

The previous prime is 669616531. The next prime is 669616573. The reversal of 669616571 is 175616966.

It is a happy number.

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 669616571 - 2¹⁰ = 669615547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669616573) 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, 70175 + ... + 79143.

It is an arithmetic number, because the mean of its divisors is an integer number (90166440).

Almost surely, 2^669616571 is an apocalyptic number.

669616571 is a deficient number, since it is larger than the sum of its proper divisors (51714949).

669616571 is a wasteful number, since it uses less digits than its factorization.

669616571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14725.

The product of its digits is 408240, while the sum is 47.

The square root of 669616571 is about 25876.9505738215. The cubic root of 669616571 is about 874.8670583334.

The spelling of 669616571 in words is "six hundred sixty-nine million, six hundred sixteen thousand, five hundred seventy-one".