216706639424 has 112 divisors (see below), whose sum is σ = 472949625600. Its totient is φ = 97701027840.

The previous prime is 216706639421. The next prime is 216706639447. The reversal of 216706639424 is 424936607612.

It is not an unprimeable number, because it can be changed into a prime (216706639421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115699352 + ... + 115701224.

Almost surely, 2^216706639424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216706639424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236474812800).

216706639424 is an abundant number, since it is smaller than the sum of its proper divisors (256242986176).

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

216706639424 is a wasteful number, since it uses less digits than its factorization.

216706639424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148 (or 3138 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 216706639424 in words is "two hundred sixteen billion, seven hundred six million, six hundred thirty-nine thousand, four hundred twenty-four".