16621423573500 has 192 divisors, whose sum is σ = 53830178088960. Its totient is φ = 4428206107200.

The previous prime is 16621423573453. The next prime is 16621423573543. The reversal of 16621423573500 is 537532412661.

16621423573500 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 1 + 4 + 23 + 573 + 50 + 0 = 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 63 ways as a sum of consecutive naturals, for example, 13771377 + ... + 14929623.

It is an arithmetic number, because the mean of its divisors is an integer number (280365510880).

Almost surely, 2^{16621423573500} is an apocalyptic number.

16621423573500 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 16621423573500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26915089044480).

16621423573500 is an abundant number, since it is smaller than the sum of its proper divisors (37208754515460).

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

16621423573500 is a wasteful number, since it uses less digits than its factorization.

16621423573500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159338 (or 1159320 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 16621423573500 in words is "sixteen trillion, six hundred twenty-one billion, four hundred twenty-three million, five hundred seventy-three thousand, five hundred".