16724705639 has 2 divisors, whose sum is σ = 16724705640. Its totient is φ = 16724705638.

The previous prime is 16724705629. The next prime is 16724705671. The reversal of 16724705639 is 93650742761.

It is a weak prime.

It is an emirp because it is prime and its reverse (93650742761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16724705639 is a prime.

It is a super-4 number, since 4×16724705639⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16724705629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8362352819 + 8362352820.

It is an arithmetic number, because the mean of its divisors is an integer number (8362352820).

Almost surely, 2^16724705639 is an apocalyptic number.

16724705639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16724705639 is an equidigital number, since it uses as much as digits as its factorization.

16724705639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 16724705639 in words is "sixteen billion, seven hundred twenty-four million, seven hundred five thousand, six hundred thirty-nine".