128248786378571 has 4 divisors (see below), whose sum is σ = 135792832636152. Its totient is φ = 120704740120992.

The previous prime is 128248786378567. The next prime is 128248786378613. The reversal of 128248786378571 is 175873687842821.

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 128248786378571 - 2² = 128248786378567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128248786378492 and 128248786378501.

It is not an unprimeable number, because it can be changed into a prime (128248786378771) 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, 3772023128765 + ... + 3772023128798.

It is an arithmetic number, because the mean of its divisors is an integer number (33948208159038).

Almost surely, 2^{128248786378571} is an apocalyptic number.

128248786378571 is a deficient number, since it is larger than the sum of its proper divisors (7544046257581).

128248786378571 is an equidigital number, since it uses as much as digits as its factorization.

128248786378571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7544046257580.

The product of its digits is 2023096320, while the sum is 77.

The spelling of 128248786378571 in words is "one hundred twenty-eight trillion, two hundred forty-eight billion, seven hundred eighty-six million, three hundred seventy-eight thousand, five hundred seventy-one".