64454645447 has 4 divisors (see below), whose sum is σ = 67257021360. Its totient is φ = 61652269536.

The previous prime is 64454645407. The next prime is 64454645483. The reversal of 64454645447 is 74454645446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64454645447 - 2¹⁸ = 64454383303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64454645407) 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, 1401187922 + ... + 1401187967.

It is an arithmetic number, because the mean of its divisors is an integer number (16814255340).

Almost surely, 2^64454645447 is an apocalyptic number.

64454645447 is a deficient number, since it is larger than the sum of its proper divisors (2802375913).

64454645447 is a wasteful number, since it uses less digits than its factorization.

64454645447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802375912.

The product of its digits is 25804800, while the sum is 53.

Subtracting 64454645447 from its reverse (74454645446), we obtain a palindrome (9999999999).

The spelling of 64454645447 in words is "sixty-four billion, four hundred fifty-four million, six hundred forty-five thousand, four hundred forty-seven".