16328988505 has 8 divisors (see below), whose sum is σ = 19604934792. Its totient is φ = 13056425088.

The previous prime is 16328988491. The next prime is 16328988521. The reversal of 16328988505 is 50588982361.

It can be written as a sum of positive squares in 4 ways, for example, as 2530492416 + 13798496089 = 50304^2 + 117467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16328988505 - 2⁹ = 16328987993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835084 + ... + 854413.

It is an arithmetic number, because the mean of its divisors is an integer number (2450616849).

Almost surely, 2^16328988505 is an apocalyptic number.

It is an amenable number.

16328988505 is a deficient number, since it is larger than the sum of its proper divisors (3275946287).

16328988505 is a wasteful number, since it uses less digits than its factorization.

16328988505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691435.

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 16328988505 in words is "sixteen billion, three hundred twenty-eight million, nine hundred eighty-eight thousand, five hundred five".