128815434586 has 4 divisors (see below), whose sum is σ = 193223151882. Its totient is φ = 64407717292.

The previous prime is 128815434563. The next prime is 128815434589. The reversal of 128815434586 is 685434518821.

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., 101534636025 + 27280798561 = 318645^2 + 165169^2 .

It is not an unprimeable number, because it can be changed into a prime (128815434589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32203858645 + ... + 32203858648.

Almost surely, 2^128815434586 is an apocalyptic number.

128815434586 is a deficient number, since it is larger than the sum of its proper divisors (64407717296).

128815434586 is an equidigital number, since it uses as much as digits as its factorization.

128815434586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64407717295.

The product of its digits is 7372800, while the sum is 55.

The spelling of 128815434586 in words is "one hundred twenty-eight billion, eight hundred fifteen million, four hundred thirty-four thousand, five hundred eighty-six".