16643368361556 has 120 divisors (see below), whose sum is σ = 45402681671424. Its totient is φ = 5306355489600.

The previous prime is 16643368361551. The next prime is 16643368361567. The reversal of 16643368361556 is 65516386334661.

16643368361556 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 3 + 3 + 6 + 8 + 3 + 615 + 5 + 6 = 666.

It is a super-2 number, since 2×16643368361556² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16643368361493 and 16643368361502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643368361551) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 318196606 + ... + 318248906.

Almost surely, 2^{16643368361556} is an apocalyptic number.

It is an amenable number.

16643368361556 is an abundant number, since it is smaller than the sum of its proper divisors (28759313309868).

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

16643368361556 is a wasteful number, since it uses less digits than its factorization.

16643368361556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95043 (or 95032 counting only the distinct ones).

The product of its digits is 167961600, while the sum is 63.

The spelling of 16643368361556 in words is "sixteen trillion, six hundred forty-three billion, three hundred sixty-eight million, three hundred sixty-one thousand, five hundred fifty-six".