216642564336 has 120 divisors (see below), whose sum is σ = 615579072640. Its totient is φ = 65604908160.

The previous prime is 216642564329. The next prime is 216642564343. The reversal of 216642564336 is 633465246612.

It is an interprime number because it is at equal distance from previous prime (216642564329) and next prime (216642564343).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9159021 + ... + 9182643.

Almost surely, 2^216642564336 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 216642564336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307789536320).

216642564336 is an abundant number, since it is smaller than the sum of its proper divisors (398936508304).

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

216642564336 is a wasteful number, since it uses less digits than its factorization.

216642564336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25235 (or 25218 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 48.

The spelling of 216642564336 in words is "two hundred sixteen billion, six hundred forty-two million, five hundred sixty-four thousand, three hundred thirty-six".