128284121647834 has 4 divisors (see below), whose sum is σ = 192426182471754. Its totient is φ = 64142060823916.

The previous prime is 128284121647813. The next prime is 128284121647837. The reversal of 128284121647834 is 438746121482821.

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

It can be written as a sum of positive squares in only one way, i.e., 116792394544809 + 11491727103025 = 10807053^2 + 3389945^2 .

It is a super-3 number, since 3×128284121647834³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (128284121647837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32071030411957 + ... + 32071030411960.

Almost surely, 2^{128284121647834} is an apocalyptic number.

128284121647834 is a deficient number, since it is larger than the sum of its proper divisors (64142060823920).

128284121647834 is an equidigital number, since it uses as much as digits as its factorization.

128284121647834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64142060823919.

The product of its digits is 33030144, while the sum is 61.

The spelling of 128284121647834 in words is "one hundred twenty-eight trillion, two hundred eighty-four billion, one hundred twenty-one million, six hundred forty-seven thousand, eight hundred thirty-four".