1405640666197 has 2 divisors, whose sum is σ = 1405640666198. Its totient is φ = 1405640666196.

The previous prime is 1405640666161. The next prime is 1405640666251. The reversal of 1405640666197 is 7916660465041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1020603042001 + 385037624196 = 1010249^2 + 620514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405640666197 - 2²⁷ = 1405506448469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1405640666497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702820333098 + 702820333099.

It is an arithmetic number, because the mean of its divisors is an integer number (702820333099).

Almost surely, 2^{1405640666197} is an apocalyptic number.

It is an amenable number.

1405640666197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1405640666197 is an equidigital number, since it uses as much as digits as its factorization.

1405640666197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 1405640666197 in words is "one trillion, four hundred five billion, six hundred forty million, six hundred sixty-six thousand, one hundred ninety-seven".