42875885581681 has 2 divisors, whose sum is σ = 42875885581682. Its totient is φ = 42875885581680.

The previous prime is 42875885581609. The next prime is 42875885581691. The reversal of 42875885581681 is 18618558857824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23328513601600 + 19547371980081 = 4829960^2 + 4421241^2 .

It is a cyclic number.

It is not a de Polignac number, because 42875885581681 - 2⁹ = 42875885581169 is a prime.

It is a super-2 number, since 2×42875885581681² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42875885581598 and 42875885581607.

It is not a weakly prime, because it can be changed into another prime (42875885581691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21437942790840 + 21437942790841.

It is an arithmetic number, because the mean of its divisors is an integer number (21437942790841).

Almost surely, 2^{42875885581681} is an apocalyptic number.

It is an amenable number.

42875885581681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42875885581681 is an equidigital number, since it uses as much as digits as its factorization.

42875885581681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1376256000, while the sum is 76.

The spelling of 42875885581681 in words is "forty-two trillion, eight hundred seventy-five billion, eight hundred eighty-five million, five hundred eighty-one thousand, six hundred eighty-one".