669912406920 has 48 divisors (see below), whose sum is σ = 2177215323660. Its totient is φ = 178643308416.

The previous prime is 669912406909. The next prime is 669912406937. The reversal of 669912406920 is 29604219966.

It is a happy number.

669912406920 is a `hidden beast` number, since 6 + 69 + 91 + 2 + 406 + 92 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 654341859396 + 15570547524 = 808914^2 + 124782^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930433539 + ... + 930434258.

Almost surely, 2^669912406920 is an apocalyptic number.

669912406920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669912406920 is an abundant number, since it is smaller than the sum of its proper divisors (1507302916740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669912406920 is a wasteful number, since it uses less digits than its factorization.

669912406920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860867814 (or 1860867807 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 669912406920 in words is "six hundred sixty-nine billion, nine hundred twelve million, four hundred six thousand, nine hundred twenty".