6669401225 has 24 divisors (see below), whose sum is σ = 8545286400. Its totient is φ = 5158296000.

The previous prime is 6669401213. The next prime is 6669401239. The reversal of 6669401225 is 5221049666.

It is a happy number.

It is not a de Polignac number, because 6669401225 - 2¹⁶ = 6669335689 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 903851 + ... + 911199.

It is an arithmetic number, because the mean of its divisors is an integer number (356053600).

Almost surely, 2^6669401225 is an apocalyptic number.

It is an amenable number.

6669401225 is a deficient number, since it is larger than the sum of its proper divisors (1875885175).

6669401225 is a wasteful number, since it uses less digits than its factorization.

6669401225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8561 (or 8556 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 6669401225 is about 81666.4020573944. The cubic root of 6669401225 is about 1882.3293543771.

The spelling of 6669401225 in words is "six billion, six hundred sixty-nine million, four hundred one thousand, two hundred twenty-five".