65440895081 has 16 divisors (see below), whose sum is σ = 68303952000. Its totient is φ = 62620766208.

The previous prime is 65440895071. The next prime is 65440895101. The reversal of 65440895081 is 18059804456.

65440895081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65440895081 is a prime.

It is a super-2 number, since 2×65440895081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65440895011) 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, 1461086 + ... + 1505208.

It is an arithmetic number, because the mean of its divisors is an integer number (4268997000).

Almost surely, 2^65440895081 is an apocalyptic number.

It is an amenable number.

65440895081 is a deficient number, since it is larger than the sum of its proper divisors (2863056919).

65440895081 is a wasteful number, since it uses less digits than its factorization.

65440895081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44608.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 65440895081 in words is "sixty-five billion, four hundred forty million, eight hundred ninety-five thousand, eighty-one".