669778067 has 8 divisors (see below), whose sum is σ = 771049056. Its totient is φ = 569904192.

The previous prime is 669778051. The next prime is 669778069. The reversal of 669778067 is 760877966.

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 669778067 - 2⁴ = 669778051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669778069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348248 + ... + 350165.

It is an arithmetic number, because the mean of its divisors is an integer number (96381132).

Almost surely, 2^669778067 is an apocalyptic number.

669778067 is a deficient number, since it is larger than the sum of its proper divisors (101270989).

669778067 is a wasteful number, since it uses less digits than its factorization.

669778067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698557.

The product of its (nonzero) digits is 5334336, while the sum is 56.

The square root of 669778067 is about 25880.0708461163. The cubic root of 669778067 is about 874.9373852337.

The spelling of 669778067 in words is "six hundred sixty-nine million, seven hundred seventy-eight thousand, sixty-seven".