128608155787 has 4 divisors (see below), whose sum is σ = 128609194240. Its totient is φ = 128607117336.

The previous prime is 128608155721. The next prime is 128608155817. The reversal of 128608155787 is 787551806821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 787551806821 = 13 ⋅60580908217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128608155787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128608155707) 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, 303612 + ... + 591097.

It is an arithmetic number, because the mean of its divisors is an integer number (32152298560).

Almost surely, 2^128608155787 is an apocalyptic number.

128608155787 is a deficient number, since it is larger than the sum of its proper divisors (1038453).

128608155787 is an equidigital number, since it uses as much as digits as its factorization.

128608155787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038452.

The product of its (nonzero) digits is 7526400, while the sum is 58.

The spelling of 128608155787 in words is "one hundred twenty-eight billion, six hundred eight million, one hundred fifty-five thousand, seven hundred eighty-seven".