40989646609 has 2 divisors, whose sum is σ = 40989646610. Its totient is φ = 40989646608.

The previous prime is 40989646597. The next prime is 40989646729. The reversal of 40989646609 is 90664698904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36463048209 + 4526598400 = 190953^2 + 67280^2 .

It is a cyclic number.

It is not a de Polignac number, because 40989646609 - 2²⁷ = 40855428881 is a prime.

It is a super-2 number, since 2×40989646609² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40989646109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20494823304 + 20494823305.

It is an arithmetic number, because the mean of its divisors is an integer number (20494823305).

Almost surely, 2^40989646609 is an apocalyptic number.

It is an amenable number.

40989646609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40989646609 is an equidigital number, since it uses as much as digits as its factorization.

40989646609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 40989646609 in words is "forty billion, nine hundred eighty-nine million, six hundred forty-six thousand, six hundred nine".