128893634497 has 2 divisors, whose sum is σ = 128893634498. Its totient is φ = 128893634496.

The previous prime is 128893634453. The next prime is 128893634521. The reversal of 128893634497 is 794436398821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109163499201 + 19730135296 = 330399^2 + 140464^2 .

It is a cyclic number.

It is not a de Polignac number, because 128893634497 - 2¹⁵ = 128893601729 is a prime.

It is a super-2 number, since 2×128893634497² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128893637497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64446817248 + 64446817249.

It is an arithmetic number, because the mean of its divisors is an integer number (64446817249).

Almost surely, 2^128893634497 is an apocalyptic number.

It is an amenable number.

128893634497 is a deficient number, since it is larger than the sum of its proper divisors (1).

128893634497 is an equidigital number, since it uses as much as digits as its factorization.

128893634497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62705664, while the sum is 64.

The spelling of 128893634497 in words is "one hundred twenty-eight billion, eight hundred ninety-three million, six hundred thirty-four thousand, four hundred ninety-seven".