64543434545 has 8 divisors (see below), whose sum is σ = 77490995496. Its totient is φ = 51608831616.

The previous prime is 64543434499. The next prime is 64543434547. The reversal of 64543434545 is 54543434546.

64543434545 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 4 ways, for example, as 226924096 + 64316510449 = 15064^2 + 253607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64543434545 - 2²⁴ = 64526657329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64543434545.

It is not an unprimeable number, because it can be changed into a prime (64543434547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3228542 + ... + 3248471.

It is an arithmetic number, because the mean of its divisors is an integer number (9686374437).

Almost surely, 2^64543434545 is an apocalyptic number.

It is an amenable number.

64543434545 is a deficient number, since it is larger than the sum of its proper divisors (12947560951).

64543434545 is a wasteful number, since it uses less digits than its factorization.

64543434545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6479011.

The product of its digits is 6912000, while the sum is 47.

Subtracting from 64543434545 its reverse (54543434546), we obtain a palindrome (9999999999).

The spelling of 64543434545 in words is "sixty-four billion, five hundred forty-three million, four hundred thirty-four thousand, five hundred forty-five".