16644554667 has 96 divisors (see below), whose sum is σ = 29474565120. Its totient is φ = 8937630720.

The previous prime is 16644554657. The next prime is 16644554699. The reversal of 16644554667 is 76645544661.

It is not a de Polignac number, because 16644554667 - 2⁶ = 16644554603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16644554657) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1771492 + ... + 1780862.

It is an arithmetic number, because the mean of its divisors is an integer number (307026720).

Almost surely, 2^16644554667 is an apocalyptic number.

16644554667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16644554667 is a deficient number, since it is larger than the sum of its proper divisors (12830010453).

16644554667 is a wasteful number, since it uses less digits than its factorization.

16644554667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473 (or 9470 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 16644554667 in words is "sixteen billion, six hundred forty-four million, five hundred fifty-four thousand, six hundred sixty-seven".