64545644432 has 20 divisors (see below), whose sum is σ = 125066174940. Its totient is φ = 32270502528.

The previous prime is 64545644431. The next prime is 64545644437. The reversal of 64545644432 is 23444654546.

64545644432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 32405760256 + 32139884176 = 180016^2 + 179276^2 .

It is a super-2 number, since 2×64545644432² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (64545644431) 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, 96794 + ... + 372102.

It is an arithmetic number, because the mean of its divisors is an integer number (6253308747).

Almost surely, 2^64545644432 is an apocalyptic number.

It is an amenable number.

64545644432 is a deficient number, since it is larger than the sum of its proper divisors (60520530508).

64545644432 is a wasteful number, since it uses less digits than its factorization.

64545644432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289970 (or 289964 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 47.

The spelling of 64545644432 in words is "sixty-four billion, five hundred forty-five million, six hundred forty-four thousand, four hundred thirty-two".