16217561128 has 16 divisors (see below), whose sum is σ = 32196628980. Its totient is φ = 7631793408.

The previous prime is 16217561099. The next prime is 16217561137. The reversal of 16217561128 is 82116571261.

It can be written as a sum of positive squares in 2 ways, for example, as 13511272644 + 2706288484 = 116238^2 + 52022^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59623251 + ... + 59623522.

Almost surely, 2^16217561128 is an apocalyptic number.

It is an amenable number.

16217561128 is a deficient number, since it is larger than the sum of its proper divisors (15979067852).

16217561128 is a wasteful number, since it uses less digits than its factorization.

16217561128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119246796 (or 119246792 counting only the distinct ones).

The product of its digits is 40320, while the sum is 40.

The spelling of 16217561128 in words is "sixteen billion, two hundred seventeen million, five hundred sixty-one thousand, one hundred twenty-eight".