16621644480 has 448 divisors, whose sum is σ = 63168995328. Its totient is φ = 3622993920.

The previous prime is 16621644463. The next prime is 16621644493. The reversal of 16621644480 is 8444612661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15206814 + ... + 15207906.

Almost surely, 2^16621644480 is an apocalyptic number.

16621644480 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 16621644480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31584497664).

16621644480 is an abundant number, since it is smaller than the sum of its proper divisors (46547350848).

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

16621644480 is a wasteful number, since it uses less digits than its factorization.

16621644480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 16621644480 in words is "sixteen billion, six hundred twenty-one million, six hundred forty-four thousand, four hundred eighty".