139066412081 has 2 divisors, whose sum is σ = 139066412082. Its totient is φ = 139066412080.

The previous prime is 139066412063. The next prime is 139066412117. The reversal of 139066412081 is 180214660931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105790815025 + 33275597056 = 325255^2 + 182416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139066412081 is a prime.

It is a super-2 number, since 2×139066412081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (139066412981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69533206040 + 69533206041.

It is an arithmetic number, because the mean of its divisors is an integer number (69533206041).

Almost surely, 2^139066412081 is an apocalyptic number.

It is an amenable number.

139066412081 is a deficient number, since it is larger than the sum of its proper divisors (1).

139066412081 is an equidigital number, since it uses as much as digits as its factorization.

139066412081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 139066412081 in words is "one hundred thirty-nine billion, sixty-six million, four hundred twelve thousand, eighty-one".