64650740499072 has 1280 divisors, whose sum is σ = 243996008256000. Its totient is φ = 16883959873536.

The previous prime is 64650740499049. The next prime is 64650740499089. The reversal of 64650740499072 is 27099404705646.

It is a happy number.

64650740499072 is a `hidden beast` number, since 6 + 4 + 6 + 5 + 0 + 74 + 0 + 499 + 0 + 72 = 666.

It is a super-2 number, since 2×64650740499072² (a number of 28 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4761777148 + ... + 4761790724.

It is an arithmetic number, because the mean of its divisors is an integer number (190621881450).

Almost surely, 2^{64650740499072} 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 64650740499072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121998004128000).

64650740499072 is an abundant number, since it is smaller than the sum of its proper divisors (179345267756928).

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

64650740499072 is a wasteful number, since it uses less digits than its factorization.

64650740499072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13740 (or 13705 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 64650740499072 in words is "sixty-four trillion, six hundred fifty billion, seven hundred forty million, four hundred ninety-nine thousand, seventy-two".