64815840802817 has 8 divisors (see below), whose sum is σ = 69802238049600. Its totient is φ = 59829524033040.

The previous prime is 64815840802793. The next prime is 64815840802873. The reversal of 64815840802817 is 71820804851846.

It is a happy number.

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 64815840802817 - 2²⁸ = 64815572367361 is a prime.

It is a super-2 number, since 2×64815840802817² (a number of 28 digits) contains 22 as substring.

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 64815840802817.

It is not an unprimeable number, because it can be changed into a prime (64815840882817) 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, 18441317 + ... + 21672882.

It is an arithmetic number, because the mean of its divisors is an integer number (8725279756200).

Almost surely, 2^{64815840802817} is an apocalyptic number.

It is an amenable number.

64815840802817 is a deficient number, since it is larger than the sum of its proper divisors (4986397246783).

64815840802817 is a wasteful number, since it uses less digits than its factorization.

64815840802817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40238503.

The product of its (nonzero) digits is 27525120, while the sum is 62.

The spelling of 64815840802817 in words is "sixty-four trillion, eight hundred fifteen billion, eight hundred forty million, eight hundred two thousand, eight hundred seventeen".