40403976865691 has 2 divisors, whose sum is σ = 40403976865692. Its totient is φ = 40403976865690.

The previous prime is 40403976865631. The next prime is 40403976865717. The reversal of 40403976865691 is 19656867930404.

40403976865691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40403976865691 is a prime.

It is not a weakly prime, because it can be changed into another prime (40403976865601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201988432845 + 20201988432846.

It is an arithmetic number, because the mean of its divisors is an integer number (20201988432846).

Almost surely, 2^{40403976865691} is an apocalyptic number.

40403976865691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40403976865691 is an equidigital number, since it uses as much as digits as its factorization.

40403976865691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235146240, while the sum is 68.

The spelling of 40403976865691 in words is "forty trillion, four hundred three billion, nine hundred seventy-six million, eight hundred sixty-five thousand, six hundred ninety-one".