64889386520769 has 24 divisors (see below), whose sum is σ = 99002694931712. Its totient is φ = 40890536134560.

The previous prime is 64889386520719. The next prime is 64889386520801. The reversal of 64889386520769 is 96702568398846.

It is a happy number.

64889386520769 is a `hidden beast` number, since 6 + 4 + 8 + 8 + 9 + 3 + 86 + 520 + 7 + 6 + 9 = 666.

It is not a de Polignac number, because 64889386520769 - 2¹⁷ = 64889386389697 is a prime.

It is a super-2 number, since 2×64889386520769² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64889386520719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2704388542 + ... + 2704412535.

Almost surely, 2^{64889386520769} is an apocalyptic number.

It is an amenable number.

64889386520769 is a deficient number, since it is larger than the sum of its proper divisors (34113308410943).

64889386520769 is a wasteful number, since it uses less digits than its factorization.

64889386520769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408801157 (or 5408801154 counting only the distinct ones).

The product of its (nonzero) digits is 7524679680, while the sum is 81.

The spelling of 64889386520769 in words is "sixty-four trillion, eight hundred eighty-nine billion, three hundred eighty-six million, five hundred twenty thousand, seven hundred sixty-nine".