1216556562028 has 24 divisors (see below), whose sum is σ = 2130136440320. Its totient is φ = 607946245200.

The previous prime is 1216556561981. The next prime is 1216556562061. The reversal of 1216556562028 is 8202656556121.

It is a super-2 number, since 2×1216556562028² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103804753 + ... + 103816471.

Almost surely, 2^{1216556562028} is an apocalyptic number.

It is an amenable number.

1216556562028 is a deficient number, since it is larger than the sum of its proper divisors (913579878292).

1216556562028 is a wasteful number, since it uses less digits than its factorization.

1216556562028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23677 (or 23675 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 1216556562028 in words is "one trillion, two hundred sixteen billion, five hundred fifty-six million, five hundred sixty-two thousand, twenty-eight".