64721615112 has 384 divisors, whose sum is σ = 228781584000. Its totient is φ = 16764088320.

The previous prime is 64721615087. The next prime is 64721615131. The reversal of 64721615112 is 21151612746.

64721615112 is a `hidden beast` number, since 6 + 4 + 7 + 21 + 615 + 1 + 12 = 666.

It is a super-3 number, since 3×64721615112³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 66244768 + ... + 66245744.

It is an arithmetic number, because the mean of its divisors is an integer number (595785375).

Almost surely, 2^64721615112 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 64721615112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114390792000).

64721615112 is an abundant number, since it is smaller than the sum of its proper divisors (164059968888).

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

64721615112 is a wasteful number, since it uses less digits than its factorization.

64721615112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586 (or 1569 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The spelling of 64721615112 in words is "sixty-four billion, seven hundred twenty-one million, six hundred fifteen thousand, one hundred twelve".