6669891400 has 48 divisors (see below), whose sum is σ = 15681780900. Its totient is φ = 2637972480.

The previous prime is 6669891343. The next prime is 6669891407. The reversal of 6669891400 is 41989666.

It can be written as a sum of positive squares in 6 ways, for example, as 3758425636 + 2911465764 = 61306^2 + 53958^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6669891407) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 169557 + ... + 205156.

Almost surely, 2^6669891400 is an apocalyptic number.

It is an amenable number.

6669891400 is an abundant number, since it is smaller than the sum of its proper divisors (9011889500).

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

6669891400 is a wasteful number, since it uses less digits than its factorization.

6669891400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374818 (or 374809 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 6669891400 is about 81669.4030834069. The cubic root of 6669891400 is about 1882.3754678715.

The spelling of 6669891400 in words is "six billion, six hundred sixty-nine million, eight hundred ninety-one thousand, four hundred".