16243453980 has 144 divisors (see below), whose sum is σ = 53159250144. Its totient is φ = 3991057920.

The previous prime is 16243453907. The next prime is 16243453999. The reversal of 16243453980 is 8935434261.

16243453980 is a `hidden beast` number, since 1 + 6 + 2 + 4 + 34 + 539 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1330062 + ... + 1342218.

Almost surely, 2^16243453980 is an apocalyptic number.

16243453980 is a gapful number since it is divisible by the number (10) 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 16243453980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26579625072).

16243453980 is an abundant number, since it is smaller than the sum of its proper divisors (36915796164).

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

16243453980 is a wasteful number, since it uses less digits than its factorization.

16243453980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12756 (or 12751 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 16243453980 in words is "sixteen billion, two hundred forty-three million, four hundred fifty-three thousand, nine hundred eighty".