669025400872 has 16 divisors (see below), whose sum is σ = 1254469626900. Its totient is φ = 334500167040.

The previous prime is 669025400851. The next prime is 669025400963. The reversal of 669025400872 is 278004520966.

It can be written as a sum of positive squares in 2 ways, for example, as 509461902756 + 159563498116 = 713766^2 + 399454^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1337847 + ... + 1768582.

Almost surely, 2^669025400872 is an apocalyptic number.

It is an amenable number.

669025400872 is a deficient number, since it is larger than the sum of its proper divisors (585444226028).

669025400872 is a wasteful number, since it uses less digits than its factorization.

669025400872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3133356 (or 3133352 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 669025400872 in words is "six hundred sixty-nine billion, twenty-five million, four hundred thousand, eight hundred seventy-two".