64245136512 has 64 divisors (see below), whose sum is σ = 170706922560. Its totient is φ = 21408046080.

The previous prime is 64245136507. The next prime is 64245136531. The reversal of 64245136512 is 21563154246.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×64245136512² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223437 + ... + 1274867.

It is an arithmetic number, because the mean of its divisors is an integer number (2667295665).

Almost surely, 2^64245136512 is an apocalyptic number.

It is an amenable number.

64245136512 is an abundant number, since it is smaller than the sum of its proper divisors (106461786048).

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

64245136512 is a wasteful number, since it uses less digits than its factorization.

64245136512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54701 (or 54689 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The spelling of 64245136512 in words is "sixty-four billion, two hundred forty-five million, one hundred thirty-six thousand, five hundred twelve".