64889531209161 has 6 divisors (see below), whose sum is σ = 93729322857690. Its totient is φ = 43259687472768.

The previous prime is 64889531209159. The next prime is 64889531209171. The reversal of 64889531209161 is 16190213598846.

64889531209161 is a `hidden beast` number, since 6 + 4 + 8 + 8 + 9 + 531 + 2 + 0 + 91 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63599987001600 + 1289544207561 = 7974960^2 + 1135581^2 .

It is not a de Polignac number, because 64889531209161 - 2¹ = 64889531209159 is a prime.

It is a super-3 number, since 3×64889531209161³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (64889531209141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3604973956056 + ... + 3604973956073.

It is an arithmetic number, because the mean of its divisors is an integer number (15621553809615).

Almost surely, 2^{64889531209161} is an apocalyptic number.

It is an amenable number.

64889531209161 is a deficient number, since it is larger than the sum of its proper divisors (28839791648529).

64889531209161 is a wasteful number, since it uses less digits than its factorization.

64889531209161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209947912135 (or 7209947912132 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 64889531209161 in words is "sixty-four trillion, eight hundred eighty-nine billion, five hundred thirty-one million, two hundred nine thousand, one hundred sixty-one".