16217161650664 has 64 divisors (see below), whose sum is σ = 33708004802640. Its totient is φ = 7267912704000.

The previous prime is 16217161650659. The next prime is 16217161650673. The reversal of 16217161650664 is 46605616171261.

It can be written as a sum of positive squares in 8 ways, for example, as 2810886964900 + 13406274685764 = 1676570^2 + 3661458^2 .

It is a super-2 number, since 2×16217161650664² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14631087 + ... + 15700414.

Almost surely, 2^{16217161650664} is an apocalyptic number.

It is an amenable number.

16217161650664 is an abundant number, since it is smaller than the sum of its proper divisors (17490843151976).

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

16217161650664 is a wasteful number, since it uses less digits than its factorization.

16217161650664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30331670 (or 30331666 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 16217161650664 in words is "sixteen trillion, two hundred seventeen billion, one hundred sixty-one million, six hundred fifty thousand, six hundred sixty-four".