6661972456 has 32 divisors (see below), whose sum is σ = 12848045760. Its totient is φ = 3236631552.

The previous prime is 6661972391. The next prime is 6661972459. The reversal of 6661972456 is 6542791666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6661972459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16221 + ... + 116563.

It is an arithmetic number, because the mean of its divisors is an integer number (401501430).

Almost surely, 2^6661972456 is an apocalyptic number.

It is an amenable number.

6661972456 is a deficient number, since it is larger than the sum of its proper divisors (6186073304).

6661972456 is a wasteful number, since it uses less digits than its factorization.

6661972456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100585 (or 100581 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 52.

The square root of 6661972456 is about 81620.9069785432. The cubic root of 6661972456 is about 1881.6302119035.

The spelling of 6661972456 in words is "six billion, six hundred sixty-one million, nine hundred seventy-two thousand, four hundred fifty-six".