64938617952 has 192 divisors, whose sum is σ = 190303706880. Its totient is φ = 19251800064.

The previous prime is 64938617899. The next prime is 64938617959. The reversal of 64938617952 is 25971683946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64938617959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20374503 + ... + 20377689.

It is an arithmetic number, because the mean of its divisors is an integer number (991165140).

Almost surely, 2^64938617952 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 64938617952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95151853440).

64938617952 is an abundant number, since it is smaller than the sum of its proper divisors (125365088928).

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

64938617952 is a wasteful number, since it uses less digits than its factorization.

64938617952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3797 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 64938617952 in words is "sixty-four billion, nine hundred thirty-eight million, six hundred seventeen thousand, nine hundred fifty-two".