64221663260653 has 8 divisors (see below), whose sum is σ = 64361528010360. Its totient is φ = 64081862108160.

The previous prime is 64221663260603. The next prime is 64221663260663. The reversal of 64221663260653 is 35606236612246.

It can be written as a sum of positive squares in 4 ways, for example, as 613812705444 + 63607850555209 = 783462^2 + 7975453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64221663260653 - 2¹⁷ = 64221663129581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64221663260653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64221663260603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13877188 + ... + 17917021.

It is an arithmetic number, because the mean of its divisors is an integer number (8045191001295).

Almost surely, 2^{64221663260653} is an apocalyptic number.

It is an amenable number.

64221663260653 is a deficient number, since it is larger than the sum of its proper divisors (139864749707).

64221663260653 is a wasteful number, since it uses less digits than its factorization.

64221663260653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31798607.

The product of its (nonzero) digits is 11197440, while the sum is 52.

Adding to 64221663260653 its reverse (35606236612246), we get a palindrome (99827899872899).

The spelling of 64221663260653 in words is "sixty-four trillion, two hundred twenty-one billion, six hundred sixty-three million, two hundred sixty thousand, six hundred fifty-three".