142018637681 has 2 divisors, whose sum is σ = 142018637682. Its totient is φ = 142018637680.

The previous prime is 142018637647. The next prime is 142018637723. The reversal of 142018637681 is 186736810241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105781708081 + 36236929600 = 325241^2 + 190360^2 .

It is an emirp because it is prime and its reverse (186736810241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142018637681 - 2¹⁰ = 142018636657 is a prime.

It is a super-2 number, since 2×142018637681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142018637611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71009318840 + 71009318841.

It is an arithmetic number, because the mean of its divisors is an integer number (71009318841).

Almost surely, 2^142018637681 is an apocalyptic number.

It is an amenable number.

142018637681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142018637681 is an equidigital number, since it uses as much as digits as its factorization.

142018637681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 142018637681 in words is "one hundred forty-two billion, eighteen million, six hundred thirty-seven thousand, six hundred eighty-one".