128520765467 has 4 divisors (see below), whose sum is σ = 128521484256. Its totient is φ = 128520046680.

The previous prime is 128520765367. The next prime is 128520765479. The reversal of 128520765467 is 764567025821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128520765467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128520765367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141653 + ... + 526409.

It is an arithmetic number, because the mean of its divisors is an integer number (32130371064).

Almost surely, 2^128520765467 is an apocalyptic number.

128520765467 is a deficient number, since it is larger than the sum of its proper divisors (718789).

128520765467 is an equidigital number, since it uses as much as digits as its factorization.

128520765467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718788.

The product of its (nonzero) digits is 5644800, while the sum is 53.

The spelling of 128520765467 in words is "one hundred twenty-eight billion, five hundred twenty million, seven hundred sixty-five thousand, four hundred sixty-seven".