65406688368 has 160 divisors (see below), whose sum is σ = 197783579136. Its totient is φ = 18235736064.

The previous prime is 65406688351. The next prime is 65406688397. The reversal of 65406688368 is 86388660456.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27059896 + ... + 27062312.

Almost surely, 2^65406688368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65406688368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98891789568).

65406688368 is an abundant number, since it is smaller than the sum of its proper divisors (132376890768).

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

65406688368 is a wasteful number, since it uses less digits than its factorization.

65406688368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351 (or 4345 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 60.

The spelling of 65406688368 in words is "sixty-five billion, four hundred six million, six hundred eighty-eight thousand, three hundred sixty-eight".