64691184144889 has 9 divisors (see below), whose sum is σ = 65302293769167. Its totient is φ = 64085741072064.

The previous prime is 64691184144817. The next prime is 64691184144913. The reversal of 64691184144889 is 98844148119646.

The square root of 64691184144889 is 8043083.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 41259001282489 + 23432182862400 = 6423317^2 + 4840680^2 .

It is not a de Polignac number, because 64691184144889 - 2¹³ = 64691184136697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64691184144289) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 860572297 + ... + 860647465.

Almost surely, 2^{64691184144889} is an apocalyptic number.

64691184144889 is the 8043083-rd square number.

64691184144889 is the 4021542-nd centered octagonal number.

It is an amenable number.

64691184144889 is a deficient number, since it is larger than the sum of its proper divisors (611109624278).

64691184144889 is an frugal number, since it uses more digits than its factorization.

64691184144889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150552 (or 75276 counting only the distinct ones).

The product of its digits is 382205952, while the sum is 73.

The spelling of 64691184144889 in words is "sixty-four trillion, six hundred ninety-one billion, one hundred eighty-four million, one hundred forty-four thousand, eight hundred eighty-nine".