16644013686641 has 24 divisors (see below), whose sum is σ = 18886335304704. Its totient is φ = 14641644600000.

The previous prime is 16644013686577. The next prime is 16644013686649. The reversal of 16644013686641 is 14668631044661.

It is not a de Polignac number, because 16644013686641 - 2⁶ = 16644013686577 is a prime.

It is a super-3 number, since 3×16644013686641³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16644013686649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47993816 + ... + 48339366.

It is an arithmetic number, because the mean of its divisors is an integer number (786930637696).

Almost surely, 2^{16644013686641} is an apocalyptic number.

16644013686641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16644013686641 is a deficient number, since it is larger than the sum of its proper divisors (2242321618063).

16644013686641 is a wasteful number, since it uses less digits than its factorization.

16644013686641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358445 (or 358434 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 56.

The spelling of 16644013686641 in words is "sixteen trillion, six hundred forty-four billion, thirteen million, six hundred eighty-six thousand, six hundred forty-one".