128575237911551 has 4 divisors (see below), whose sum is σ = 128582688542352. Its totient is φ = 128567787280752.

The previous prime is 128575237911401. The next prime is 128575237911559. The reversal of 128575237911551 is 155119732575821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128575237911551 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 (128575237911559) 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, 3725289515 + ... + 3725324028.

It is an arithmetic number, because the mean of its divisors is an integer number (32145672135588).

Almost surely, 2^{128575237911551} is an apocalyptic number.

128575237911551 is a deficient number, since it is larger than the sum of its proper divisors (7450630801).

128575237911551 is an equidigital number, since it uses as much as digits as its factorization.

128575237911551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450630800.

The product of its digits is 26460000, while the sum is 62.

The spelling of 128575237911551 in words is "one hundred twenty-eight trillion, five hundred seventy-five billion, two hundred thirty-seven million, nine hundred eleven thousand, five hundred fifty-one".