1997017477069 has 2 divisors, whose sum is σ = 1997017477070. Its totient is φ = 1997017477068.

The previous prime is 1997017476917. The next prime is 1997017477111. The reversal of 1997017477069 is 9607747107991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1817271155844 + 179746321225 = 1348062^2 + 423965^2 .

It is an emirp because it is prime and its reverse (9607747107991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997017477069 - 2¹¹ = 1997017475021 is a prime.

It is a super-2 number, since 2×1997017477069² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1997017476995 and 1997017477013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997017477769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998508738534 + 998508738535.

It is an arithmetic number, because the mean of its divisors is an integer number (998508738535).

Almost surely, 2^{1997017477069} is an apocalyptic number.

It is an amenable number.

1997017477069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997017477069 is an equidigital number, since it uses as much as digits as its factorization.

1997017477069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42007896, while the sum is 67.

The spelling of 1997017477069 in words is "one trillion, nine hundred ninety-seven billion, seventeen million, four hundred seventy-seven thousand, sixty-nine".