216861853504 has 28 divisors (see below), whose sum is σ = 430949217348. Its totient is φ = 108276224000.

The previous prime is 216861853493. The next prime is 216861853519. The reversal of 216861853504 is 405358168612.

It can be written as a sum of positive squares in 2 ways, for example, as 197775878400 + 19085975104 = 444720^2 + 138152^2 .

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, 2372017 + ... + 2461744.

Almost surely, 2^216861853504 is an apocalyptic number.

It is an amenable number.

216861853504 is a deficient number, since it is larger than the sum of its proper divisors (214087363844).

216861853504 is an equidigital number, since it uses as much as digits as its factorization.

216861853504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834474 (or 4834464 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 216861853504 in words is "two hundred sixteen billion, eight hundred sixty-one million, eight hundred fifty-three thousand, five hundred four".