42143009681 has 2 divisors, whose sum is σ = 42143009682. Its totient is φ = 42143009680.

The previous prime is 42143009651. The next prime is 42143009693. The reversal of 42143009681 is 18690034124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34784115025 + 7358894656 = 186505^2 + 85784^2 .

It is a cyclic number.

It is not a de Polignac number, because 42143009681 - 2¹⁴ = 42142993297 is a prime.

It is a super-2 number, since 2×42143009681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42143009611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21071504840 + 21071504841.

It is an arithmetic number, because the mean of its divisors is an integer number (21071504841).

Almost surely, 2^42143009681 is an apocalyptic number.

It is an amenable number.

42143009681 is a deficient number, since it is larger than the sum of its proper divisors (1).

42143009681 is an equidigital number, since it uses as much as digits as its factorization.

42143009681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 42143009681 in words is "forty-two billion, one hundred forty-three million, nine thousand, six hundred eighty-one".