128401616569 has 2 divisors, whose sum is σ = 128401616570. Its totient is φ = 128401616568.

The previous prime is 128401616533. The next prime is 128401616597. The reversal of 128401616569 is 965616104821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122272605625 + 6129010944 = 349675^2 + 78288^2 .

It is a cyclic number.

It is not a de Polignac number, because 128401616569 - 2¹⁷ = 128401485497 is a prime.

It is a super-4 number, since 4×128401616569⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (128401617569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64200808284 + 64200808285.

It is an arithmetic number, because the mean of its divisors is an integer number (64200808285).

Almost surely, 2^128401616569 is an apocalyptic number.

It is an amenable number.

128401616569 is a deficient number, since it is larger than the sum of its proper divisors (1).

128401616569 is an equidigital number, since it uses as much as digits as its factorization.

128401616569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 128401616569 in words is "one hundred twenty-eight billion, four hundred one million, six hundred sixteen thousand, five hundred sixty-nine".