669627917 has 8 divisors (see below), whose sum is σ = 779728896. Its totient is φ = 563136912.

The previous prime is 669627859. The next prime is 669627923. The reversal of 669627917 is 719726966.

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 669627917 - 2¹⁸ = 669365773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669627997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 902093 + ... + 902834.

It is an arithmetic number, because the mean of its divisors is an integer number (97466112).

Almost surely, 2^669627917 is an apocalyptic number.

It is an amenable number.

669627917 is a deficient number, since it is larger than the sum of its proper divisors (110100979).

669627917 is a wasteful number, since it uses less digits than its factorization.

669627917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804987.

The product of its digits is 1714608, while the sum is 53.

The square root of 669627917 is about 25877.1698027431. The cubic root of 669627917 is about 874.8719995619.

The spelling of 669627917 in words is "six hundred sixty-nine million, six hundred twenty-seven thousand, nine hundred seventeen".