128026686269 has 2 divisors, whose sum is σ = 128026686270. Its totient is φ = 128026686268.

The previous prime is 128026686239. The next prime is 128026686287. The reversal of 128026686269 is 962686620821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104245036900 + 23781649369 = 322870^2 + 154213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128026686269 is a prime.

It is a super-2 number, since 2×128026686269² (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 (128026686239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64013343134 + 64013343135.

It is an arithmetic number, because the mean of its divisors is an integer number (64013343135).

Almost surely, 2^128026686269 is an apocalyptic number.

It is an amenable number.

128026686269 is a deficient number, since it is larger than the sum of its proper divisors (1).

128026686269 is an equidigital number, since it uses as much as digits as its factorization.

128026686269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 56.

The spelling of 128026686269 in words is "one hundred twenty-eight billion, twenty-six million, six hundred eighty-six thousand, two hundred sixty-nine".