16643722660811 has 32 divisors (see below), whose sum is σ = 17296660684800. Its totient is φ = 15998443776000.

The previous prime is 16643722660759. The next prime is 16643722660813. The reversal of 16643722660811 is 11806622734661.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16643722660811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16643722660813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8810863355 + ... + 8810865243.

It is an arithmetic number, because the mean of its divisors is an integer number (540520646400).

Almost surely, 2^{16643722660811} is an apocalyptic number.

16643722660811 is a deficient number, since it is larger than the sum of its proper divisors (652938023989).

16643722660811 is a wasteful number, since it uses less digits than its factorization.

16643722660811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 16643722660811 in words is "sixteen trillion, six hundred forty-three billion, seven hundred twenty-two million, six hundred sixty thousand, eight hundred eleven".