65688047488 has 128 divisors (see below), whose sum is σ = 151776000000. Its totient is φ = 27736031232.

The previous prime is 65688047479. The next prime is 65688047507. The reversal of 65688047488 is 88474088656.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×65688047488² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52591888 + ... + 52593136.

It is an arithmetic number, because the mean of its divisors is an integer number (1185750000).

Almost surely, 2^65688047488 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 65688047488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75888000000).

65688047488 is an abundant number, since it is smaller than the sum of its proper divisors (86087952512).

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

65688047488 is a wasteful number, since it uses less digits than its factorization.

65688047488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 64.

The spelling of 65688047488 in words is "sixty-five billion, six hundred eighty-eight million, forty-seven thousand, four hundred eighty-eight".