6672996721 has 8 divisors (see below), whose sum is σ = 6692450688. Its totient is φ = 6653562000.

The previous prime is 6672996653. The next prime is 6672996833. The reversal of 6672996721 is 1276992766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6672996721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6672990721) 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, 953766 + ... + 960736.

It is an arithmetic number, because the mean of its divisors is an integer number (836556336).

Almost surely, 2^6672996721 is an apocalyptic number.

It is an amenable number.

6672996721 is a deficient number, since it is larger than the sum of its proper divisors (19453967).

6672996721 is a wasteful number, since it uses less digits than its factorization.

6672996721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623.

The product of its digits is 3429216, while the sum is 55.

The square root of 6672996721 is about 81688.4124034737. The cubic root of 6672996721 is about 1882.6675502461.

The spelling of 6672996721 in words is "six billion, six hundred seventy-two million, nine hundred ninety-six thousand, seven hundred twenty-one".