64081695744 has 264 divisors, whose sum is σ = 202374739008. Its totient is φ = 19368837120.

The previous prime is 64081695739. The next prime is 64081695761. The reversal of 64081695744 is 44759618046.

64081695744 is a `hidden beast` number, since 6 + 4 + 0 + 8 + 1 + 69 + 574 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (264).

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, 65589784 + ... + 65590760.

Almost surely, 2^64081695744 is an apocalyptic number.

64081695744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64081695744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101187369504).

64081695744 is an abundant number, since it is smaller than the sum of its proper divisors (138293043264).

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

64081695744 is a wasteful number, since it uses less digits than its factorization.

64081695744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 64081695744 in words is "sixty-four billion, eighty-one million, six hundred ninety-five thousand, seven hundred forty-four".