216556541553 has 16 divisors (see below), whose sum is σ = 316997654976. Its totient is φ = 130410421440.

The previous prime is 216556541549. The next prime is 216556541567. The reversal of 216556541553 is 355145655612.

It is not a de Polignac number, because 216556541553 - 2² = 216556541549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216556546553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20893926 + ... + 20904287.

It is an arithmetic number, because the mean of its divisors is an integer number (19812353436).

Almost surely, 2^216556541553 is an apocalyptic number.

It is an amenable number.

216556541553 is a deficient number, since it is larger than the sum of its proper divisors (100441113423).

216556541553 is a wasteful number, since it uses less digits than its factorization.

216556541553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41798384.

The product of its digits is 2700000, while the sum is 48.

The spelling of 216556541553 in words is "two hundred sixteen billion, five hundred fifty-six million, five hundred forty-one thousand, five hundred fifty-three".