128249363311 has 4 divisors (see below), whose sum is σ = 128323798792. Its totient is φ = 128174927832.

The previous prime is 128249363309. The next prime is 128249363321. The reversal of 128249363311 is 113363942821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128249363311 - 2¹ = 128249363309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128249363321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37215156 + ... + 37218601.

It is an arithmetic number, because the mean of its divisors is an integer number (32080949698).

Almost surely, 2^128249363311 is an apocalyptic number.

128249363311 is a deficient number, since it is larger than the sum of its proper divisors (74435481).

128249363311 is an equidigital number, since it uses as much as digits as its factorization.

128249363311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74435480.

The product of its digits is 186624, while the sum is 43.

The spelling of 128249363311 in words is "one hundred twenty-eight billion, two hundred forty-nine million, three hundred sixty-three thousand, three hundred eleven".