16728737721413 has 2 divisors, whose sum is σ = 16728737721414. Its totient is φ = 16728737721412.

The previous prime is 16728737721337. The next prime is 16728737721439. The reversal of 16728737721413 is 31412773782761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16540432062049 + 188305659364 = 4066993^2 + 433942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16728737721413 is a prime.

It is a super-2 number, since 2×16728737721413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16728737721473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8364368860706 + 8364368860707.

It is an arithmetic number, because the mean of its divisors is an integer number (8364368860707).

Almost surely, 2^{16728737721413} is an apocalyptic number.

It is an amenable number.

16728737721413 is a deficient number, since it is larger than the sum of its proper divisors (1).

16728737721413 is an equidigital number, since it uses as much as digits as its factorization.

16728737721413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 59.

The spelling of 16728737721413 in words is "sixteen trillion, seven hundred twenty-eight billion, seven hundred thirty-seven million, seven hundred twenty-one thousand, four hundred thirteen".