5642539412409 has 9 divisors (see below), whose sum is σ = 8150345000239. Its totient is φ = 3761688190800.

The previous prime is 5642539412333. The next prime is 5642539412467. The reversal of 5642539412409 is 9042149352465.

The square root of 5642539412409 is 2375403.

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

5642539412409 is a `hidden beast` number, since 5 + 6 + 4 + 2 + 5 + 394 + 1 + 240 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3880123858809 + 1762415553600 = 1969803^2 + 1327560^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 5642539412409 - 2⁷ = 5642539412281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5642539412509) 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, 6730309 + ... + 7522109.

Almost surely, 2^{5642539412409} is an apocalyptic number.

5642539412409 is the 2375403-rd square number.

5642539412409 is the 1187702-nd centered octagonal number.

It is an amenable number.

5642539412409 is a deficient number, since it is larger than the sum of its proper divisors (2507805587830).

5642539412409 is an frugal number, since it uses more digits than its factorization.

5642539412409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583608 (or 791804 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 5642539412409 in words is "five trillion, six hundred forty-two billion, five hundred thirty-nine million, four hundred twelve thousand, four hundred nine".