216549465552 has 360 divisors, whose sum is σ = 774110203776. Its totient is φ = 58230918144.

The previous prime is 216549465551. The next prime is 216549465553. The reversal of 216549465552 is 255564945612.

216549465552 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 49 + 46 + 5 + 552 = 666.

It is an interprime number because it is at equal distance from previous prime (216549465551) and next prime (216549465553).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216549465551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3205273 + ... + 3272135.

Almost surely, 2^216549465552 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 216549465552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387055101888).

216549465552 is an abundant number, since it is smaller than the sum of its proper divisors (557560738224).

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

216549465552 is a wasteful number, since it uses less digits than its factorization.

216549465552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66917 (or 66892 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The spelling of 216549465552 in words is "two hundred sixteen billion, five hundred forty-nine million, four hundred sixty-five thousand, five hundred fifty-two".