142442161681 has 2 divisors, whose sum is σ = 142442161682. Its totient is φ = 142442161680.

The previous prime is 142442161637. The next prime is 142442161753. The reversal of 142442161681 is 186161244241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140696259025 + 1745902656 = 375095^2 + 41784^2 .

It is a cyclic number.

It is not a de Polignac number, because 142442161681 - 2¹³ = 142442153489 is a prime.

It is a super-2 number, since 2×142442161681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142442111681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71221080840 + 71221080841.

It is an arithmetic number, because the mean of its divisors is an integer number (71221080841).

Almost surely, 2^142442161681 is an apocalyptic number.

It is an amenable number.

142442161681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142442161681 is an equidigital number, since it uses as much as digits as its factorization.

142442161681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 40.

The spelling of 142442161681 in words is "one hundred forty-two billion, four hundred forty-two million, one hundred sixty-one thousand, six hundred eighty-one".