216687366840 has 192 divisors, whose sum is σ = 776633162400. Its totient is φ = 48189883392.

The previous prime is 216687366817. The next prime is 216687366859. The reversal of 216687366840 is 48663786612.

216687366840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 280435 + ... + 715554.

Almost surely, 2^216687366840 is an apocalyptic number.

216687366840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216687366840 is an abundant number, since it is smaller than the sum of its proper divisors (559945795560).

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

216687366840 is a wasteful number, since it uses less digits than its factorization.

216687366840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996054 (or 996043 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 57.

The spelling of 216687366840 in words is "two hundred sixteen billion, six hundred eighty-seven million, three hundred sixty-six thousand, eight hundred forty".