64653421916161 has 8 divisors (see below), whose sum is σ = 69878122219304. Its totient is φ = 59464630206720.

The previous prime is 64653421916131. The next prime is 64653421916179. The reversal of 64653421916161 is 16161912435646.

It can be written as a sum of positive squares in 4 ways, for example, as 8116481915136 + 56536940001025 = 2848944^2 + 7519105^2 .

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 64653421916161 - 2¹⁹ = 64653421391873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64653421916131) 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, 8977144680 + ... + 8977151881.

It is an arithmetic number, because the mean of its divisors is an integer number (8734765277413).

Almost surely, 2^{64653421916161} is an apocalyptic number.

It is an amenable number.

64653421916161 is a deficient number, since it is larger than the sum of its proper divisors (5224700303143).

64653421916161 is a wasteful number, since it uses less digits than its factorization.

64653421916161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17954296851.

The product of its digits is 5598720, while the sum is 55.

The spelling of 64653421916161 in words is "sixty-four trillion, six hundred fifty-three billion, four hundred twenty-one million, nine hundred sixteen thousand, one hundred sixty-one".