42865545561481 has 4 divisors (see below), whose sum is σ = 42868055711812. Its totient is φ = 42863035411152.

The previous prime is 42865545561389. The next prime is 42865545561569. The reversal of 42865545561481 is 18416554556824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26082725765625 + 16782819795856 = 5107125^2 + 4096684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42865545561481 is a prime.

It is a super-2 number, since 2×42865545561481² (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 (42865545562481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255049550 + ... + 1255083703.

It is an arithmetic number, because the mean of its divisors is an integer number (10717013927953).

Almost surely, 2^{42865545561481} is an apocalyptic number.

It is an amenable number.

42865545561481 is a deficient number, since it is larger than the sum of its proper divisors (2510150331).

42865545561481 is a wasteful number, since it uses less digits than its factorization.

42865545561481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510150330.

The product of its digits is 184320000, while the sum is 64.

The spelling of 42865545561481 in words is "forty-two trillion, eight hundred sixty-five billion, five hundred forty-five million, five hundred sixty-one thousand, four hundred eighty-one".