206153442525181 has 2 divisors, whose sum is σ = 206153442525182. Its totient is φ = 206153442525180.

The previous prime is 206153442525167. The next prime is 206153442525229. The reversal of 206153442525181 is 181525244351602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138078715476100 + 68074727049081 = 11750690^2 + 8250741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206153442525181 is a prime.

It is a super-2 number, since 2×206153442525181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206153442525131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103076721262590 + 103076721262591.

It is an arithmetic number, because the mean of its divisors is an integer number (103076721262591).

Almost surely, 2^{206153442525181} is an apocalyptic number.

It is an amenable number.

206153442525181 is a deficient number, since it is larger than the sum of its proper divisors (1).

206153442525181 is an equidigital number, since it uses as much as digits as its factorization.

206153442525181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304000, while the sum is 49.

Adding to 206153442525181 its reverse (181525244351602), we get a palindrome (387678686876783).

The spelling of 206153442525181 in words is "two hundred six trillion, one hundred fifty-three billion, four hundred forty-two million, five hundred twenty-five thousand, one hundred eighty-one".