1997077712429 has 2 divisors, whose sum is σ = 1997077712430. Its totient is φ = 1997077712428.

The previous prime is 1997077712393. The next prime is 1997077712437. The reversal of 1997077712429 is 9242177707991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1913513356804 + 83564355625 = 1383298^2 + 289075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997077712429 - 2¹² = 1997077708333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997077762429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998538856214 + 998538856215.

It is an arithmetic number, because the mean of its divisors is an integer number (998538856215).

Almost surely, 2^{1997077712429} is an apocalyptic number.

It is an amenable number.

1997077712429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997077712429 is an equidigital number, since it uses as much as digits as its factorization.

1997077712429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28005264, while the sum is 65.

The spelling of 1997077712429 in words is "one trillion, nine hundred ninety-seven billion, seventy-seven million, seven hundred twelve thousand, four hundred twenty-nine".