128126220682 has 4 divisors (see below), whose sum is σ = 192189331026. Its totient is φ = 64063110340.

The previous prime is 128126220637. The next prime is 128126220697. The reversal of 128126220682 is 286022621821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 286022621821 = 60343 ⋅4739947.

It can be written as a sum of positive squares in only one way, i.e., 123911744121 + 4214476561 = 352011^2 + 64919^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32031555169 + ... + 32031555172.

Almost surely, 2^128126220682 is an apocalyptic number.

128126220682 is a deficient number, since it is larger than the sum of its proper divisors (64063110344).

128126220682 is an equidigital number, since it uses as much as digits as its factorization.

128126220682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64063110343.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 128126220682 in words is "one hundred twenty-eight billion, one hundred twenty-six million, two hundred twenty thousand, six hundred eighty-two".