42991799881 has 2 divisors, whose sum is σ = 42991799882. Its totient is φ = 42991799880.

The previous prime is 42991799867. The next prime is 42991799891. The reversal of 42991799881 is 18899719924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39354624400 + 3637175481 = 198380^2 + 60309^2 .

It is a cyclic number.

It is not a de Polignac number, because 42991799881 - 2¹¹ = 42991797833 is a prime.

It is a super-2 number, since 2×42991799881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42991799831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21495899940 + 21495899941.

It is an arithmetic number, because the mean of its divisors is an integer number (21495899941).

Almost surely, 2^42991799881 is an apocalyptic number.

It is an amenable number.

42991799881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42991799881 is an equidigital number, since it uses as much as digits as its factorization.

42991799881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 67.

The spelling of 42991799881 in words is "forty-two billion, nine hundred ninety-one million, seven hundred ninety-nine thousand, eight hundred eighty-one".