128984338766 has 4 divisors (see below), whose sum is σ = 193476508152. Its totient is φ = 64492169382.

The previous prime is 128984338739. The next prime is 128984338781. The reversal of 128984338766 is 667833489821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 667833489821 = 229 ⋅2916303449.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32246084690 + ... + 32246084693.

It is an arithmetic number, because the mean of its divisors is an integer number (48369127038).

Almost surely, 2^128984338766 is an apocalyptic number.

128984338766 is a deficient number, since it is larger than the sum of its proper divisors (64492169386).

128984338766 is an equidigital number, since it uses as much as digits as its factorization.

128984338766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64492169385.

The product of its digits is 83607552, while the sum is 65.

The spelling of 128984338766 in words is "one hundred twenty-eight billion, nine hundred eighty-four million, three hundred thirty-eight thousand, seven hundred sixty-six".