16664144645 has 8 divisors (see below), whose sum is σ = 20006274456. Its totient is φ = 13325115136.

The previous prime is 16664144593. The next prime is 16664144647. The reversal of 16664144645 is 54644146661.

It can be written as a sum of positive squares in 4 ways, for example, as 174724 + 16663969921 = 418^2 + 129089^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16664144645 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16664144645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664144647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763232 + ... + 784761.

It is an arithmetic number, because the mean of its divisors is an integer number (2500784307).

Almost surely, 2^16664144645 is an apocalyptic number.

It is an amenable number.

16664144645 is a deficient number, since it is larger than the sum of its proper divisors (3342129811).

16664144645 is a wasteful number, since it uses less digits than its factorization.

16664144645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550151.

The product of its digits is 1658880, while the sum is 47.

The spelling of 16664144645 in words is "sixteen billion, six hundred sixty-four million, one hundred forty-four thousand, six hundred forty-five".