64896441440641 has 16 divisors (see below), whose sum is σ = 66692417176000. Its totient is φ = 63114086891520.

The previous prime is 64896441440591. The next prime is 64896441440659. The reversal of 64896441440641 is 14604414469846.

It is a cyclic number.

It is not a de Polignac number, because 64896441440641 - 2⁷ = 64896441440513 is a prime.

It is a super-2 number, since 2×64896441440641² (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 64896441440641.

It is not an unprimeable number, because it can be changed into a prime (64896441440681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5798401 + ... + 12783361.

It is an arithmetic number, because the mean of its divisors is an integer number (4168276073500).

Almost surely, 2^{64896441440641} is an apocalyptic number.

It is an amenable number.

64896441440641 is a deficient number, since it is larger than the sum of its proper divisors (1795975735359).

64896441440641 is a wasteful number, since it uses less digits than its factorization.

64896441440641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985936.

The product of its (nonzero) digits is 63700992, while the sum is 61.

The spelling of 64896441440641 in words is "sixty-four trillion, eight hundred ninety-six billion, four hundred forty-one million, four hundred forty thousand, six hundred forty-one".