128704665469 has 2 divisors, whose sum is σ = 128704665470. Its totient is φ = 128704665468.

The previous prime is 128704665461. The next prime is 128704665473. The reversal of 128704665469 is 964566407821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121687252569 + 7017412900 = 348837^2 + 83770^2 .

It is a cyclic number.

It is not a de Polignac number, because 128704665469 - 2³ = 128704665461 is a prime.

It is a super-2 number, since 2×128704665469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128704665461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64352332734 + 64352332735.

It is an arithmetic number, because the mean of its divisors is an integer number (64352332735).

Almost surely, 2^128704665469 is an apocalyptic number.

It is an amenable number.

128704665469 is a deficient number, since it is larger than the sum of its proper divisors (1).

128704665469 is an equidigital number, since it uses as much as digits as its factorization.

128704665469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17418240, while the sum is 58.

The spelling of 128704665469 in words is "one hundred twenty-eight billion, seven hundred four million, six hundred sixty-five thousand, four hundred sixty-nine".