64538580712388 has 12 divisors (see below), whose sum is σ = 113245311199020. Its totient is φ = 32182777512672.

The previous prime is 64538580712381. The next prime is 64538580712399. The reversal of 64538580712388 is 88321708583546.

It can be written as a sum of positive squares in 2 ways, for example, as 55498804861504 + 9039775850884 = 7449752^2 + 3006622^2 .

It is not an unprimeable number, because it can be changed into a prime (64538580712381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21628209203 + ... + 21628212186.

It is an arithmetic number, because the mean of its divisors is an integer number (9437109266585).

Almost surely, 2^{64538580712388} is an apocalyptic number.

It is an amenable number.

64538580712388 is a deficient number, since it is larger than the sum of its proper divisors (48706730486632).

64538580712388 is a wasteful number, since it uses less digits than its factorization.

64538580712388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43256421766 (or 43256421764 counting only the distinct ones).

The product of its (nonzero) digits is 309657600, while the sum is 68.

The spelling of 64538580712388 in words is "sixty-four trillion, five hundred thirty-eight billion, five hundred eighty million, seven hundred twelve thousand, three hundred eighty-eight".