40618469509 has 2 divisors, whose sum is σ = 40618469510. Its totient is φ = 40618469508.

The previous prime is 40618469443. The next prime is 40618469513. The reversal of 40618469509 is 90596481604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24446260609 + 16172208900 = 156353^2 + 127170^2 .

It is a cyclic number.

It is not a de Polignac number, because 40618469509 - 2³³ = 32028534917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40618469569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20309234754 + 20309234755.

It is an arithmetic number, because the mean of its divisors is an integer number (20309234755).

Almost surely, 2^40618469509 is an apocalyptic number.

It is an amenable number.

40618469509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40618469509 is an equidigital number, since it uses as much as digits as its factorization.

40618469509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 40618469509 in words is "forty billion, six hundred eighteen million, four hundred sixty-nine thousand, five hundred nine".