65422128665 has 4 divisors (see below), whose sum is σ = 78506554404. Its totient is φ = 52337702928.

The previous prime is 65422128649. The next prime is 65422128703. The reversal of 65422128665 is 56682122456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9800208016 + 55621920649 = 98996^2 + 235843^2 .

It is a cyclic number.

It is not a de Polignac number, because 65422128665 - 2⁴ = 65422128649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6542212862 + ... + 6542212871.

It is an arithmetic number, because the mean of its divisors is an integer number (19626638601).

Almost surely, 2^65422128665 is an apocalyptic number.

It is an amenable number.

65422128665 is a deficient number, since it is larger than the sum of its proper divisors (13084425739).

65422128665 is a wasteful number, since it uses less digits than its factorization.

65422128665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13084425738.

The product of its digits is 1382400, while the sum is 47.

The spelling of 65422128665 in words is "sixty-five billion, four hundred twenty-two million, one hundred twenty-eight thousand, six hundred sixty-five".