64996259328 has 1440 divisors, whose sum is σ = 269266203360. Its totient is φ = 15328051200.

The previous prime is 64996259327. The next prime is 64996259329. The reversal of 64996259328 is 82395269946.

64996259328 is a `hidden beast` number, since 6 + 499 + 62 + 59 + 32 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (64996259327) and next prime (64996259329).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64996259327) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1065512418 + ... + 1065512478.

It is an arithmetic number, because the mean of its divisors is an integer number (186990419).

Almost surely, 2^64996259328 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 64996259328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134633101680).

64996259328 is an abundant number, since it is smaller than the sum of its proper divisors (204269944032).

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

64996259328 is a wasteful number, since it uses less digits than its factorization.

64996259328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 97 counting only the distinct ones).

The product of its digits is 50388480, while the sum is 63.

The spelling of 64996259328 in words is "sixty-four billion, nine hundred ninety-six million, two hundred fifty-nine thousand, three hundred twenty-eight".