65281647864 has 32 divisors (see below), whose sum is σ = 163217088720. Its totient is φ = 21758820096.

The previous prime is 65281647773. The next prime is 65281647869. The reversal of 65281647864 is 46874618256.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 220642 + ... + 423374.

Almost surely, 2^65281647864 is an apocalyptic number.

It is an amenable number.

65281647864 is an abundant number, since it is smaller than the sum of its proper divisors (97935440856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65281647864 is a wasteful number, since it uses less digits than its factorization.

65281647864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216159 (or 216155 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 57.

The spelling of 65281647864 in words is "sixty-five billion, two hundred eighty-one million, six hundred forty-seven thousand, eight hundred sixty-four".