128640914069 has 2 divisors, whose sum is σ = 128640914070. Its totient is φ = 128640914068.

The previous prime is 128640914053. The next prime is 128640914089. The reversal of 128640914069 is 960419046821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79545433444 + 49095480625 = 282038^2 + 221575^2 .

It is a cyclic number.

It is not a de Polignac number, because 128640914069 - 2⁴ = 128640914053 is a prime.

It is a super-2 number, since 2×128640914069² (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 (128640914089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64320457034 + 64320457035.

It is an arithmetic number, because the mean of its divisors is an integer number (64320457035).

Almost surely, 2^128640914069 is an apocalyptic number.

It is an amenable number.

128640914069 is a deficient number, since it is larger than the sum of its proper divisors (1).

128640914069 is an equidigital number, since it uses as much as digits as its factorization.

128640914069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 128640914069 in words is "one hundred twenty-eight billion, six hundred forty million, nine hundred fourteen thousand, sixty-nine".