64621612647 has 40 divisors (see below), whose sum is σ = 97825654080. Its totient is φ = 42507374400.

The previous prime is 64621612631. The next prime is 64621612669. The reversal of 64621612647 is 74621612646.

64621612647 is a `hidden beast` number, since 6 + 4 + 6 + 21 + 612 + 6 + 4 + 7 = 666.

It is not a de Polignac number, because 64621612647 - 2⁴ = 64621612631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64621612607) 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 39 ways as a sum of consecutive naturals, for example, 2383554 + ... + 2410512.

It is an arithmetic number, because the mean of its divisors is an integer number (2445641352).

Almost surely, 2^64621612647 is an apocalyptic number.

64621612647 is a deficient number, since it is larger than the sum of its proper divisors (33204041433).

64621612647 is a wasteful number, since it uses less digits than its factorization.

64621612647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27365 (or 27356 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

Subtracting 64621612647 from its reverse (74621612646), we obtain a palindrome (9999999999).

The spelling of 64621612647 in words is "sixty-four billion, six hundred twenty-one million, six hundred twelve thousand, six hundred forty-seven".