16721502727 has 2 divisors, whose sum is σ = 16721502728. Its totient is φ = 16721502726.

The previous prime is 16721502709. The next prime is 16721502739. The reversal of 16721502727 is 72720512761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16721502727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16721502727.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721506727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360751363 + 8360751364.

It is an arithmetic number, because the mean of its divisors is an integer number (8360751364).

Almost surely, 2^16721502727 is an apocalyptic number.

16721502727 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721502727 is an equidigital number, since it uses as much as digits as its factorization.

16721502727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 40.

The spelling of 16721502727 in words is "sixteen billion, seven hundred twenty-one million, five hundred two thousand, seven hundred twenty-seven".