65281647865 has 16 divisors (see below), whose sum is σ = 91218348288. Its totient is φ = 43919942976.

The previous prime is 65281647773. The next prime is 65281647869. The reversal of 65281647865 is 56874618256.

It is a happy number.

It is not a de Polignac number, because 65281647865 - 2²³ = 65273259257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65281647869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17594277 + ... + 17597986.

It is an arithmetic number, because the mean of its divisors is an integer number (5701146768).

Almost surely, 2^65281647865 is an apocalyptic number.

It is an amenable number.

65281647865 is a deficient number, since it is larger than the sum of its proper divisors (25936700423).

65281647865 is a wasteful number, since it uses less digits than its factorization.

65281647865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35192328.

The product of its digits is 19353600, while the sum is 58.

The spelling of 65281647865 in words is "sixty-five billion, two hundred eighty-one million, six hundred forty-seven thousand, eight hundred sixty-five".