216649749360 has 480 divisors, whose sum is σ = 780628036608. Its totient is φ = 49272903680.

The previous prime is 216649749359. The next prime is 216649749427. The reversal of 216649749360 is 63947946612.

It is a happy number.

It is a super-2 number, since 2×216649749360² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216649749360.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 74016217 + ... + 74019143.

Almost surely, 2^216649749360 is an apocalyptic number.

216649749360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216649749360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390314018304).

216649749360 is an abundant number, since it is smaller than the sum of its proper divisors (563978287248).

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

216649749360 is a wasteful number, since it uses less digits than its factorization.

216649749360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 216649749360 in words is "two hundred sixteen billion, six hundred forty-nine million, seven hundred forty-nine thousand, three hundred sixty".