6720556442 has 8 divisors (see below), whose sum is σ = 10081567476. Its totient is φ = 3360033952.

The previous prime is 6720556393. The next prime is 6720556489. The reversal of 6720556442 is 2446550276.

It is a Cunningham number, because it is equal to 81979²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 6720556441 + 1 = 81979^2 + 1^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 6720556442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85553 + ... + 144084.

Almost surely, 2^6720556442 is an apocalyptic number.

6720556442 is a deficient number, since it is larger than the sum of its proper divisors (3361011034).

6720556442 is a wasteful number, since it uses less digits than its factorization.

6720556442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244272.

The product of its (nonzero) digits is 403200, while the sum is 41.

The square root of 6720556442 is about 81979.0000060991. Note that the first 5 decimals coincide. The cubic root of 6720556442 is about 1887.1296764643.

The spelling of 6720556442 in words is "six billion, seven hundred twenty million, five hundred fifty-six thousand, four hundred forty-two".