40397655217 has 2 divisors, whose sum is σ = 40397655218. Its totient is φ = 40397655216.

The previous prime is 40397655211. The next prime is 40397655227. The reversal of 40397655217 is 71255679304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40359202816 + 38452401 = 200896^2 + 6201^2 .

It is a cyclic number.

It is not a de Polignac number, because 40397655217 - 2²³ = 40389266609 is a prime.

It is not a weakly prime, because it can be changed into another prime (40397655211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20198827608 + 20198827609.

It is an arithmetic number, because the mean of its divisors is an integer number (20198827609).

Almost surely, 2^40397655217 is an apocalyptic number.

It is an amenable number.

40397655217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40397655217 is an equidigital number, since it uses as much as digits as its factorization.

40397655217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 40397655217 in words is "forty billion, three hundred ninety-seven million, six hundred fifty-five thousand, two hundred seventeen".