6556421423601 has 27 divisors (see below), whose sum is σ = 11016662403513. Its totient is φ = 3746495801160.

The previous prime is 6556421423549. The next prime is 6556421423627. The reversal of 6556421423601 is 1063241246556.

The square root of 6556421423601 is 2560551.

It is a perfect power (a square), and thus also a powerful number.

6556421423601 is a `hidden beast` number, since 6 + 5 + 5 + 6 + 4 + 2 + 14 + 23 + 601 = 666.

It is not a de Polignac number, because 6556421423601 - 2²⁷ = 6556287205873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6556421421601) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 53710606 + ... + 53832536.

Almost surely, 2^{6556421423601} is an apocalyptic number.

6556421423601 is the 2560551-st square number.

6556421423601 is the 1280276-th centered octagonal number.

It is an amenable number.

6556421423601 is a deficient number, since it is larger than the sum of its proper divisors (4460240979912).

6556421423601 is an frugal number, since it uses more digits than its factorization.

6556421423601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243882 (or 121941 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 6556421423601 in words is "six trillion, five hundred fifty-six billion, four hundred twenty-one million, four hundred twenty-three thousand, six hundred one".