64543720732 has 6 divisors (see below), whose sum is σ = 112951511288. Its totient is φ = 32271860364.

The previous prime is 64543720729. The next prime is 64543720733. The reversal of 64543720732 is 23702734546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64543720733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8067965088 + ... + 8067965095.

Almost surely, 2^64543720732 is an apocalyptic number.

It is an amenable number.

64543720732 is a deficient number, since it is larger than the sum of its proper divisors (48407790556).

64543720732 is a wasteful number, since it uses less digits than its factorization.

64543720732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16135930187 (or 16135930185 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 43.

The spelling of 64543720732 in words is "sixty-four billion, five hundred forty-three million, seven hundred twenty thousand, seven hundred thirty-two".