28165571216639 has 2 divisors, whose sum is σ = 28165571216640. Its totient is φ = 28165571216638.

The previous prime is 28165571216599. The next prime is 28165571216647. The reversal of 28165571216639 is 93661217556182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28165571216639 - 2²⁴ = 28165554439423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28165571216669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14082785608319 + 14082785608320.

It is an arithmetic number, because the mean of its divisors is an integer number (14082785608320).

Almost surely, 2^{28165571216639} is an apocalyptic number.

28165571216639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28165571216639 is an equidigital number, since it uses as much as digits as its factorization.

28165571216639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 62.

The spelling of 28165571216639 in words is "twenty-eight trillion, one hundred sixty-five billion, five hundred seventy-one million, two hundred sixteen thousand, six hundred thirty-nine".