64228868641 has 4 divisors (see below), whose sum is σ = 73404421312. Its totient is φ = 55053315972.

The previous prime is 64228868633. The next prime is 64228868651. The reversal of 64228868641 is 14686882246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64228868641 - 2³ = 64228868633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64228868651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4587776325 + ... + 4587776338.

It is an arithmetic number, because the mean of its divisors is an integer number (18351105328).

Almost surely, 2^64228868641 is an apocalyptic number.

It is an amenable number.

64228868641 is a deficient number, since it is larger than the sum of its proper divisors (9175552671).

64228868641 is an equidigital number, since it uses as much as digits as its factorization.

64228868641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9175552670.

The product of its digits is 7077888, while the sum is 55.

The spelling of 64228868641 in words is "sixty-four billion, two hundred twenty-eight million, eight hundred sixty-eight thousand, six hundred forty-one".