16721887038589 has 2 divisors, whose sum is σ = 16721887038590. Its totient is φ = 16721887038588.

The previous prime is 16721887038547. The next prime is 16721887038617. The reversal of 16721887038589 is 98583078812761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13549687380100 + 3172199658489 = 3680990^2 + 1781067^2 .

It is a cyclic number.

It is not a de Polignac number, because 16721887038589 - 2²³ = 16721878649981 is a prime.

It is a super-2 number, since 2×16721887038589² (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 (16721887032589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360943519294 + 8360943519295.

It is an arithmetic number, because the mean of its divisors is an integer number (8360943519295).

Almost surely, 2^{16721887038589} is an apocalyptic number.

It is an amenable number.

16721887038589 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721887038589 is an equidigital number, since it uses as much as digits as its factorization.

16721887038589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 325140480, while the sum is 73.

The spelling of 16721887038589 in words is "sixteen trillion, seven hundred twenty-one billion, eight hundred eighty-seven million, thirty-eight thousand, five hundred eighty-nine".