1216541632564 has 12 divisors (see below), whose sum is σ = 2144264029600. Its totient is φ = 603894766968.

The previous prime is 1216541632541. The next prime is 1216541632643. The reversal of 1216541632564 is 4652361456121.

It is a super-2 number, since 2×1216541632564² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094011704 + ... + 1094012815.

Almost surely, 2^{1216541632564} is an apocalyptic number.

It is an amenable number.

1216541632564 is a deficient number, since it is larger than the sum of its proper divisors (927722397036).

1216541632564 is a wasteful number, since it uses less digits than its factorization.

1216541632564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188024662 (or 2188024660 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The spelling of 1216541632564 in words is "one trillion, two hundred sixteen billion, five hundred forty-one million, six hundred thirty-two thousand, five hundred sixty-four".