40686607691 has 2 divisors, whose sum is σ = 40686607692. Its totient is φ = 40686607690.

The previous prime is 40686607681. The next prime is 40686607699. The reversal of 40686607691 is 19670668604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40686607691 - 2¹⁴ = 40686591307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (40686607699) 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, 20343303845 + 20343303846.

It is an arithmetic number, because the mean of its divisors is an integer number (20343303846).

Almost surely, 2^40686607691 is an apocalyptic number.

40686607691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40686607691 is an equidigital number, since it uses as much as digits as its factorization.

40686607691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 40686607691 in words is "forty billion, six hundred eighty-six million, six hundred seven thousand, six hundred ninety-one".