40612806691 has 2 divisors, whose sum is σ = 40612806692. Its totient is φ = 40612806690.

The previous prime is 40612806683. The next prime is 40612806739. The reversal of 40612806691 is 19660821604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40612806691 - 2³ = 40612806683 is a prime.

It is not a weakly prime, because it can be changed into another prime (40612806601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20306403345 + 20306403346.

It is an arithmetic number, because the mean of its divisors is an integer number (20306403346).

Almost surely, 2^40612806691 is an apocalyptic number.

40612806691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40612806691 is an equidigital number, since it uses as much as digits as its factorization.

40612806691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 40612806691 in words is "forty billion, six hundred twelve million, eight hundred six thousand, six hundred ninety-one".