64889385953969 has 8 divisors (see below), whose sum is σ = 65086913540520. Its totient is φ = 64692156974976.

The previous prime is 64889385953929. The next prime is 64889385954031. The reversal of 64889385953969 is 96935958398846.

It can be written as a sum of positive squares in 4 ways, for example, as 16627743310369 + 48261642643600 = 4077713^2 + 6947060^2 .

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 64889385953969 - 2²⁰ = 64889384905393 is a prime.

It is a super-2 number, since 2×64889385953969² (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 (64889385953929) 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, 74216612 + ... + 75085845.

It is an arithmetic number, because the mean of its divisors is an integer number (8135864192565).

Almost surely, 2^{64889385953969} is an apocalyptic number.

It is an amenable number.

64889385953969 is a deficient number, since it is larger than the sum of its proper divisors (197527586551).

64889385953969 is a wasteful number, since it uses less digits than its factorization.

64889385953969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149303779.

The product of its digits is 108839116800, while the sum is 92.

The spelling of 64889385953969 in words is "sixty-four trillion, eight hundred eighty-nine billion, three hundred eighty-five million, nine hundred fifty-three thousand, nine hundred sixty-nine".