16218021456 has 180 divisors, whose sum is σ = 56169598368. Its totient is φ = 4277235456.

The previous prime is 16218021433. The next prime is 16218021481. The reversal of 16218021456 is 65412081261.

It is a happy number.

16218021456 is a `hidden beast` number, since 1 + 6 + 2 + 180 + 21 + 456 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16218021456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 122751 + ... + 217953.

Almost surely, 2^16218021456 is an apocalyptic number.

16218021456 is a gapful number since it is divisible by the number (16) 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 16218021456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28084799184).

16218021456 is an abundant number, since it is smaller than the sum of its proper divisors (39951576912).

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

16218021456 is a wasteful number, since it uses less digits than its factorization.

16218021456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95250 (or 95228 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 16218021456 in words is "sixteen billion, two hundred eighteen million, twenty-one thousand, four hundred fifty-six".