64461181768 has 32 divisors (see below), whose sum is σ = 121967658360. Its totient is φ = 31936629760.

The previous prime is 64461181747. The next prime is 64461181787. The reversal of 64461181768 is 86718116446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7551262404 + 56909919364 = 86898^2 + 238558^2 .

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, 4401498 + ... + 4416118.

Almost surely, 2^64461181768 is an apocalyptic number.

It is an amenable number.

64461181768 is a deficient number, since it is larger than the sum of its proper divisors (57506476592).

64461181768 is a wasteful number, since it uses less digits than its factorization.

64461181768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19617 (or 19613 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The spelling of 64461181768 in words is "sixty-four billion, four hundred sixty-one million, one hundred eighty-one thousand, seven hundred sixty-eight".