65864512681 has 16 divisors (see below), whose sum is σ = 75831459840. Its totient is φ = 56577240720.

The previous prime is 65864512621. The next prime is 65864512687. The reversal of 65864512681 is 18621546856.

It is not a de Polignac number, because 65864512681 - 2⁹ = 65864512169 is a prime.

It is a super-3 number, since 3×65864512681³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65864512687) 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, 331365 + ... + 491458.

It is an arithmetic number, because the mean of its divisors is an integer number (4739466240).

Almost surely, 2^65864512681 is an apocalyptic number.

It is an amenable number.

65864512681 is a deficient number, since it is larger than the sum of its proper divisors (9966947159).

65864512681 is a wasteful number, since it uses less digits than its factorization.

65864512681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823236.

The product of its digits is 2764800, while the sum is 52.

The spelling of 65864512681 in words is "sixty-five billion, eight hundred sixty-four million, five hundred twelve thousand, six hundred eighty-one".