6720556403 has 8 divisors (see below), whose sum is σ = 7469847216. Its totient is φ = 5994320800.

The previous prime is 6720556393. The next prime is 6720556489. The reversal of 6720556403 is 3046550276.

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

It is a cyclic number.

It is not a de Polignac number, because 6720556403 - 2¹⁴ = 6720540019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720556103) 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, 5763188 + ... + 5764353.

It is an arithmetic number, because the mean of its divisors is an integer number (933730902).

Almost surely, 2^6720556403 is an apocalyptic number.

6720556403 is a deficient number, since it is larger than the sum of its proper divisors (749290813).

6720556403 is a wasteful number, since it uses less digits than its factorization.

6720556403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11527605.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 6720556403 is about 81978.9997682333. Note that the first 3 decimals coincide. The cubic root of 6720556403 is about 1887.1296728139.

Adding to 6720556403 its sum of digits (38), we get a square (6720556441 = 81979²).

The spelling of 6720556403 in words is "six billion, seven hundred twenty million, five hundred fifty-six thousand, four hundred three".