64646113536 has 81 divisors (see below), whose sum is σ = 186425877001. Its totient is φ = 21544636416.

The previous prime is 64646113447. The next prime is 64646113591. The reversal of 64646113536 is 63531164646.

The square root of 64646113536 is 254256.

It is a perfect power (a square), and thus also a powerful number.

64646113536 is a `hidden beast` number, since 6 + 46 + 4 + 61 + 13 + 536 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52752902400 + 11893211136 = 229680^2 + 109056^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64646113491 and 64646113500.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12201640 + ... + 12206936.

Almost surely, 2^64646113536 is an apocalyptic number.

64646113536 is the 254256-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64646113536

64646113536 is an abundant number, since it is smaller than the sum of its proper divisors (121779763465).

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

64646113536 is an frugal number, since it uses more digits than its factorization.

64646113536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616 (or 5302 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The spelling of 64646113536 in words is "sixty-four billion, six hundred forty-six million, one hundred thirteen thousand, five hundred thirty-six".