16818132661556 has 96 divisors (see below), whose sum is σ = 33715642746240. Its totient is φ = 7289613398016.

The previous prime is 16818132661549. The next prime is 16818132661579. The reversal of 16818132661556 is 65516623181861.

It is a super-2 number, since 2×16818132661556² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16818132661495 and 16818132661504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62345240 + ... + 62614416.

It is an arithmetic number, because the mean of its divisors is an integer number (351204611940).

Almost surely, 2^{16818132661556} is an apocalyptic number.

It is an amenable number.

16818132661556 is an abundant number, since it is smaller than the sum of its proper divisors (16897510084684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16818132661556 is a wasteful number, since it uses less digits than its factorization.

16818132661556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270561 (or 270559 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 59.

The spelling of 16818132661556 in words is "sixteen trillion, eight hundred eighteen billion, one hundred thirty-two million, six hundred sixty-one thousand, five hundred fifty-six".