128887638041 has 2 divisors, whose sum is σ = 128887638042. Its totient is φ = 128887638040.

The previous prime is 128887638029. The next prime is 128887638127. The reversal of 128887638041 is 140836788821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128865922441 + 21715600 = 358979^2 + 4660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128887638041 is a prime.

It is a super-2 number, since 2×128887638041² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128887628041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64443819020 + 64443819021.

It is an arithmetic number, because the mean of its divisors is an integer number (64443819021).

Almost surely, 2^128887638041 is an apocalyptic number.

It is an amenable number.

128887638041 is a deficient number, since it is larger than the sum of its proper divisors (1).

128887638041 is an equidigital number, since it uses as much as digits as its factorization.

128887638041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 128887638041 in words is "one hundred twenty-eight billion, eight hundred eighty-seven million, six hundred thirty-eight thousand, forty-one".