64777814976 has 168 divisors, whose sum is σ = 199525835136. Its totient is φ = 18493816320.

The previous prime is 64777814963. The next prime is 64777815013. The reversal of 64777814976 is 67941877746.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23208141 + ... + 23210931.

Almost surely, 2^64777814976 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 64777814976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99762917568).

64777814976 is an abundant number, since it is smaller than the sum of its proper divisors (134748020160).

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

64777814976 is a wasteful number, since it uses less digits than its factorization.

64777814976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287 (or 5270 counting only the distinct ones).

The product of its digits is 99574272, while the sum is 66.

The spelling of 64777814976 in words is "sixty-four billion, seven hundred seventy-seven million, eight hundred fourteen thousand, nine hundred seventy-six".