64523432545 has 16 divisors (see below), whose sum is σ = 90964504512. Its totient is φ = 43316429760.

The previous prime is 64523432543. The next prime is 64523432599. The reversal of 64523432545 is 54523432546.

64523432545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64523432545 - 2¹ = 64523432543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64523432543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45120567 + ... + 45121996.

It is an arithmetic number, because the mean of its divisors is an integer number (5685281532).

Almost surely, 2^64523432545 is an apocalyptic number.

64523432545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64523432545 is a deficient number, since it is larger than the sum of its proper divisors (26441071967).

64523432545 is a wasteful number, since it uses less digits than its factorization.

64523432545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90242592.

The product of its digits is 1728000, while the sum is 43.

Subtracting from 64523432545 its reverse (54523432546), we obtain a palindrome (9999999999).

The spelling of 64523432545 in words is "sixty-four billion, five hundred twenty-three million, four hundred thirty-two thousand, five hundred forty-five".