142864393681 has 2 divisors, whose sum is σ = 142864393682. Its totient is φ = 142864393680.

The previous prime is 142864393669. The next prime is 142864393733. The reversal of 142864393681 is 186393468241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142820503056 + 43890625 = 377916^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 142864393681 - 2²³ = 142856005073 is a prime.

It is a super-2 number, since 2×142864393681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142864393621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71432196840 + 71432196841.

It is an arithmetic number, because the mean of its divisors is an integer number (71432196841).

Almost surely, 2^142864393681 is an apocalyptic number.

It is an amenable number.

142864393681 is a deficient number, since it is larger than the sum of its proper divisors (1).

142864393681 is an equidigital number, since it uses as much as digits as its factorization.

142864393681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 55.

The spelling of 142864393681 in words is "one hundred forty-two billion, eight hundred sixty-four million, three hundred ninety-three thousand, six hundred eighty-one".