42865133839609 has 9 divisors (see below), whose sum is σ = 43796877137071. Its totient is φ = 41952808546600.

The previous prime is 42865133839579. The next prime is 42865133839657. The reversal of 42865133839609 is 90693833156824.

The square root of 42865133839609 is 6547147.

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., 39960768031209 + 2904365808400 = 6321453^2 + 1704220^2 .

It is not a de Polignac number, because 42865133839609 - 2⁹ = 42865133839097 is a prime.

It is a super-4 number, since 4×42865133839609⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42865133839109) 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, 307646259 + ... + 307785559.

Almost surely, 2^{42865133839609} is an apocalyptic number.

42865133839609 is the 6547147-th square number.

42865133839609 is the 3273574-th centered octagonal number.

It is an amenable number.

42865133839609 is a deficient number, since it is larger than the sum of its proper divisors (931743297462).

42865133839609 is an frugal number, since it uses more digits than its factorization.

42865133839609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278696 (or 139348 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 67.

The spelling of 42865133839609 in words is "forty-two trillion, eight hundred sixty-five billion, one hundred thirty-three million, eight hundred thirty-nine thousand, six hundred nine".