281857161563 has 2 divisors, whose sum is σ = 281857161564. Its totient is φ = 281857161562.

The previous prime is 281857161541. The next prime is 281857161643. The reversal of 281857161563 is 365161758182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281857161563 - 2⁶ = 281857161499 is a prime.

It is not a weakly prime, because it can be changed into another prime (281857161763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140928580781 + 140928580782.

It is an arithmetic number, because the mean of its divisors is an integer number (140928580782).

Almost surely, 2^281857161563 is an apocalyptic number.

281857161563 is a deficient number, since it is larger than the sum of its proper divisors (1).

281857161563 is an equidigital number, since it uses as much as digits as its factorization.

281857161563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 53.

The spelling of 281857161563 in words is "two hundred eighty-one billion, eight hundred fifty-seven million, one hundred sixty-one thousand, five hundred sixty-three".