16556615655611 has 8 divisors (see below), whose sum is σ = 16574906296320. Its totient is φ = 16538325613992.

The previous prime is 16556615655581. The next prime is 16556615655617. The reversal of 16556615655611 is 11655651665561.

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-16556615655611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16556615655617) 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, 76999496 + ... + 77214218.

It is an arithmetic number, because the mean of its divisors is an integer number (2071863287040).

Almost surely, 2^{16556615655611} is an apocalyptic number.

16556615655611 is a deficient number, since it is larger than the sum of its proper divisors (18290640709).

16556615655611 is an equidigital number, since it uses as much as digits as its factorization.

16556615655611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299545.

The product of its digits is 24300000, while the sum is 59.

The spelling of 16556615655611 in words is "sixteen trillion, five hundred fifty-six billion, six hundred fifteen million, six hundred fifty-five thousand, six hundred eleven".