669670885 has 16 divisors (see below), whose sum is σ = 916329456. Its totient is φ = 465435648.

The previous prime is 669670879. The next prime is 669670889. The reversal of 669670885 is 588076966.

It is a happy number.

It is a Cunningham number, because it is equal to 25878²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 6041764 + 663629121 = 2458^2 + 25761^2 .

It is a cyclic number.

It is not a de Polignac number, because 669670885 - 2⁵ = 669670853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669670889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301914 + ... + 304123.

It is an arithmetic number, because the mean of its divisors is an integer number (57270591).

Almost surely, 2^669670885 is an apocalyptic number.

669670885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669670885 is a deficient number, since it is larger than the sum of its proper divisors (246658571).

669670885 is a wasteful number, since it uses less digits than its factorization.

669670885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606072.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The square root of 669670885 is about 25878.0000193214. Note that the first 4 decimals coincide. The cubic root of 669670885 is about 874.8907117926.

The spelling of 669670885 in words is "six hundred sixty-nine million, six hundred seventy thousand, eight hundred eighty-five".