40197718791271 has 2 divisors, whose sum is σ = 40197718791272. Its totient is φ = 40197718791270.

The previous prime is 40197718791253. The next prime is 40197718791361. The reversal of 40197718791271 is 17219781779104.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40197718791271 - 2¹¹ = 40197718789223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40197718794271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20098859395635 + 20098859395636.

It is an arithmetic number, because the mean of its divisors is an integer number (20098859395636).

Almost surely, 2^{40197718791271} is an apocalyptic number.

40197718791271 is a deficient number, since it is larger than the sum of its proper divisors (1).

40197718791271 is an equidigital number, since it uses as much as digits as its factorization.

40197718791271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12446784, while the sum is 64.

The spelling of 40197718791271 in words is "forty trillion, one hundred ninety-seven billion, seven hundred eighteen million, seven hundred ninety-one thousand, two hundred seventy-one".