64656884665 has 8 divisors (see below), whose sum is σ = 77589626688. Its totient is φ = 51724597680.

The previous prime is 64656884641. The next prime is 64656884693. The reversal of 64656884665 is 56648865646.

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

It is not a de Polignac number, because 64656884665 - 2⁹ = 64656884153 is a prime.

It is a super-2 number, since 2×64656884665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64656884597 and 64656884606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495154 + ... + 611956.

It is an arithmetic number, because the mean of its divisors is an integer number (9698703336).

Almost surely, 2^64656884665 is an apocalyptic number.

It is an amenable number.

64656884665 is a deficient number, since it is larger than the sum of its proper divisors (12932742023).

64656884665 is a wasteful number, since it uses less digits than its factorization.

64656884665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227519.

The product of its digits is 199065600, while the sum is 64.

The spelling of 64656884665 in words is "sixty-four billion, six hundred fifty-six million, eight hundred eighty-four thousand, six hundred sixty-five".