65440764589 has 4 divisors (see below), whose sum is σ = 65442208860. Its totient is φ = 65439320320.

The previous prime is 65440764577. The next prime is 65440764629. The reversal of 65440764589 is 98546704456.

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 37989908100 + 27450856489 = 194910^2 + 165683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65440764589 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65440714589) 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, 651892 + ... + 745549.

It is an arithmetic number, because the mean of its divisors is an integer number (16360552215).

Almost surely, 2^65440764589 is an apocalyptic number.

It is an amenable number.

65440764589 is a deficient number, since it is larger than the sum of its proper divisors (1444271).

65440764589 is a wasteful number, since it uses less digits than its factorization.

65440764589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444270.

The product of its (nonzero) digits is 29030400, while the sum is 58.

The spelling of 65440764589 in words is "sixty-five billion, four hundred forty million, seven hundred sixty-four thousand, five hundred eighty-nine".