16621765615488 has 256 divisors, whose sum is σ = 48278744513280. Its totient is φ = 5025054720000.

The previous prime is 16621765615463. The next prime is 16621765615493. The reversal of 16621765615488 is 88451656712661.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4672971406 + ... + 4672974962.

It is an arithmetic number, because the mean of its divisors is an integer number (188588845755).

Almost surely, 2^{16621765615488} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16621765615488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24139372256640).

16621765615488 is an abundant number, since it is smaller than the sum of its proper divisors (31656978897792).

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

16621765615488 is a wasteful number, since it uses less digits than its factorization.

16621765615488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5877 (or 5865 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 66.

The spelling of 16621765615488 in words is "sixteen trillion, six hundred twenty-one billion, seven hundred sixty-five million, six hundred fifteen thousand, four hundred eighty-eight".