40378066697 has 2 divisors, whose sum is σ = 40378066698. Its totient is φ = 40378066696.

The previous prime is 40378066679. The next prime is 40378066793. The reversal of 40378066697 is 79666087304.

It is a happy number.

Together with previous prime (40378066679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37244754121 + 3133312576 = 192989^2 + 55976^2 .

It is a cyclic number.

It is not a de Polignac number, because 40378066697 - 2¹⁸ = 40377804553 is a prime.

It is not a weakly prime, because it can be changed into another prime (40378066997) 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, 20189033348 + 20189033349.

It is an arithmetic number, because the mean of its divisors is an integer number (20189033349).

Almost surely, 2^40378066697 is an apocalyptic number.

It is an amenable number.

40378066697 is a deficient number, since it is larger than the sum of its proper divisors (1).

40378066697 is an equidigital number, since it uses as much as digits as its factorization.

40378066697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 40378066697 in words is "forty billion, three hundred seventy-eight million, sixty-six thousand, six hundred ninety-seven".