16320785721982 has 64 divisors (see below), whose sum is σ = 28742826954240. Its totient is φ = 6806114574336.

The previous prime is 16320785721973. The next prime is 16320785722039. The reversal of 16320785721982 is 28912758702361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16320785721982.

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, 639090718 + ... + 639116254.

It is an arithmetic number, because the mean of its divisors is an integer number (449106671160).

Almost surely, 2^{16320785721982} is an apocalyptic number.

16320785721982 is a deficient number, since it is larger than the sum of its proper divisors (12422041232258).

16320785721982 is a wasteful number, since it uses less digits than its factorization.

16320785721982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33905.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 16320785721982 in words is "sixteen trillion, three hundred twenty billion, seven hundred eighty-five million, seven hundred twenty-one thousand, nine hundred eighty-two".