40436689169 has 2 divisors, whose sum is σ = 40436689170. Its totient is φ = 40436689168.

The previous prime is 40436689099. The next prime is 40436689207. The reversal of 40436689169 is 96198663404.

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., 23750508544 + 16686180625 = 154112^2 + 129175^2 .

It is a cyclic number.

It is not a de Polignac number, because 40436689169 - 2³² = 36141721873 is a prime.

It is a super-2 number, since 2×40436689169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40436689369) 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, 20218344584 + 20218344585.

It is an arithmetic number, because the mean of its divisors is an integer number (20218344585).

Almost surely, 2^40436689169 is an apocalyptic number.

It is an amenable number.

40436689169 is a deficient number, since it is larger than the sum of its proper divisors (1).

40436689169 is an equidigital number, since it uses as much as digits as its factorization.

40436689169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 40436689169 in words is "forty billion, four hundred thirty-six million, six hundred eighty-nine thousand, one hundred sixty-nine".