669900655 has 16 divisors (see below), whose sum is σ = 838110240. Its totient is φ = 513571968.

The previous prime is 669900643. The next prime is 669900659. The reversal of 669900655 is 556009966.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669900655 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669900659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18000 + ... + 40789.

It is an arithmetic number, because the mean of its divisors is an integer number (52381890).

Almost surely, 2^669900655 is an apocalyptic number.

669900655 is a deficient number, since it is larger than the sum of its proper divisors (168209585).

669900655 is a wasteful number, since it uses less digits than its factorization.

669900655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58890.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 669900655 is about 25882.4391238538. The cubic root of 669900655 is about 874.9907612630.

The spelling of 669900655 in words is "six hundred sixty-nine million, nine hundred thousand, six hundred fifty-five".