40681109449 has 2 divisors, whose sum is σ = 40681109450. Its totient is φ = 40681109448.

The previous prime is 40681109431. The next prime is 40681109507. The reversal of 40681109449 is 94490118604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40605071049 + 76038400 = 201507^2 + 8720^2 .

It is a cyclic number.

It is not a de Polignac number, because 40681109449 - 2¹⁹ = 40680585161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40681109399 and 40681109408.

It is not a weakly prime, because it can be changed into another prime (40681107449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20340554724 + 20340554725.

It is an arithmetic number, because the mean of its divisors is an integer number (20340554725).

Almost surely, 2^40681109449 is an apocalyptic number.

It is an amenable number.

40681109449 is a deficient number, since it is larger than the sum of its proper divisors (1).

40681109449 is an equidigital number, since it uses as much as digits as its factorization.

40681109449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 40681109449 in words is "forty billion, six hundred eighty-one million, one hundred nine thousand, four hundred forty-nine".