128218772071 has 16 divisors (see below), whose sum is σ = 139062924000. Its totient is φ = 118215948864.

The previous prime is 128218772069. The next prime is 128218772117. The reversal of 128218772071 is 170277812821.

It is not a de Polignac number, because 128218772071 - 2¹ = 128218772069 is a prime.

It is a super-2 number, since 2×128218772071² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128218772021) 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 15 ways as a sum of consecutive naturals, for example, 1848780 + ... + 1916878.

It is an arithmetic number, because the mean of its divisors is an integer number (8691432750).

Almost surely, 2^128218772071 is an apocalyptic number.

128218772071 is a deficient number, since it is larger than the sum of its proper divisors (10844151929).

128218772071 is an frugal number, since it uses more digits than its factorization.

128218772071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68995 (or 68969 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 46.

The spelling of 128218772071 in words is "one hundred twenty-eight billion, two hundred eighteen million, seven hundred seventy-two thousand, seventy-one".