16744640251 has 4 divisors (see below), whose sum is σ = 17472668112. Its totient is φ = 16016612392.

The previous prime is 16744640249. The next prime is 16744640261. The reversal of 16744640251 is 15204644761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16744640251 - 2¹ = 16744640249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16744640261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364013896 + ... + 364013941.

It is an arithmetic number, because the mean of its divisors is an integer number (4368167028).

Almost surely, 2^16744640251 is an apocalyptic number.

16744640251 is a deficient number, since it is larger than the sum of its proper divisors (728027861).

16744640251 is an equidigital number, since it uses as much as digits as its factorization.

16744640251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728027860.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 16744640251 in words is "sixteen billion, seven hundred forty-four million, six hundred forty thousand, two hundred fifty-one".