16749567641 has 4 divisors (see below), whose sum is σ = 16752844800. Its totient is φ = 16746290484.

The previous prime is 16749567631. The next prime is 16749567661. The reversal of 16749567641 is 14676594761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14676594761 = 1543 ⋅9511727.

It is a cyclic number.

It is not a de Polignac number, because 16749567641 - 2¹⁸ = 16749305497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16749567631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1630901 + ... + 1641138.

It is an arithmetic number, because the mean of its divisors is an integer number (4188211200).

Almost surely, 2^16749567641 is an apocalyptic number.

It is an amenable number.

16749567641 is a deficient number, since it is larger than the sum of its proper divisors (3277159).

16749567641 is an equidigital number, since it uses as much as digits as its factorization.

16749567641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3277158.

The product of its digits is 7620480, while the sum is 56.

The spelling of 16749567641 in words is "sixteen billion, seven hundred forty-nine million, five hundred sixty-seven thousand, six hundred forty-one".