128155484551821 has 32 divisors (see below), whose sum is σ = 182739489723648. Its totient is φ = 79606678609920.

The previous prime is 128155484551811. The next prime is 128155484551847.

128155484551821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 128155484551821 - 2⁵ = 128155484551789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128155484551811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8035225 + ... + 17913006.

It is an arithmetic number, because the mean of its divisors is an integer number (5710609053864).

Almost surely, 2^{128155484551821} is an apocalyptic number.

It is an amenable number.

128155484551821 is a deficient number, since it is larger than the sum of its proper divisors (54584005171827).

128155484551821 is a wasteful number, since it uses less digits than its factorization.

128155484551821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25949221.

The product of its digits is 20480000, while the sum is 60.

The spelling of 128155484551821 in words is "one hundred twenty-eight trillion, one hundred fifty-five billion, four hundred eighty-four million, five hundred fifty-one thousand, eight hundred twenty-one".