6643556553466 has 32 divisors (see below), whose sum is σ = 11452928941440. Its totient is φ = 2831275083456.

The previous prime is 6643556553421. The next prime is 6643556553509.

6643556553466 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6643556553466² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6643556553398 and 6643556553407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1373716 + ... + 3895408.

It is an arithmetic number, because the mean of its divisors is an integer number (357904029420).

Almost surely, 2^{6643556553466} is an apocalyptic number.

6643556553466 is a deficient number, since it is larger than the sum of its proper divisors (4809372387974).

6643556553466 is a wasteful number, since it uses less digits than its factorization.

6643556553466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522758.

The product of its digits is 699840000, while the sum is 64.

The spelling of 6643556553466 in words is "six trillion, six hundred forty-three billion, five hundred fifty-six million, five hundred fifty-three thousand, four hundred sixty-six".