64662525647 has 4 divisors (see below), whose sum is σ = 64663037976. Its totient is φ = 64662013320.

The previous prime is 64662525617. The next prime is 64662525661. The reversal of 64662525647 is 74652526646.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74652526646 = 2 ⋅37326263323.

It is a cyclic number.

It is not a de Polignac number, because 64662525647 - 2⁸ = 64662525391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64662525617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81668 + ... + 368774.

It is an arithmetic number, because the mean of its divisors is an integer number (16165759494).

Almost surely, 2^64662525647 is an apocalyptic number.

64662525647 is a deficient number, since it is larger than the sum of its proper divisors (512329).

64662525647 is a wasteful number, since it uses less digits than its factorization.

64662525647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512328.

The product of its digits is 14515200, while the sum is 53.

Subtracting 64662525647 from its reverse (74652526646), we obtain a palindrome (9990000999).

The spelling of 64662525647 in words is "sixty-four billion, six hundred sixty-two million, five hundred twenty-five thousand, six hundred forty-seven".