128638611833 has 2 divisors, whose sum is σ = 128638611834. Its totient is φ = 128638611832.

The previous prime is 128638611823. The next prime is 128638611851. The reversal of 128638611833 is 338116836821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112196191849 + 16442419984 = 334957^2 + 128228^2 .

It is a cyclic number.

It is not a de Polignac number, because 128638611833 - 2¹² = 128638607737 is a prime.

It is not a weakly prime, because it can be changed into another prime (128638611823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64319305916 + 64319305917.

It is an arithmetic number, because the mean of its divisors is an integer number (64319305917).

Almost surely, 2^128638611833 is an apocalyptic number.

It is an amenable number.

128638611833 is a deficient number, since it is larger than the sum of its proper divisors (1).

128638611833 is an equidigital number, since it uses as much as digits as its factorization.

128638611833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The spelling of 128638611833 in words is "one hundred twenty-eight billion, six hundred thirty-eight million, six hundred eleven thousand, eight hundred thirty-three".