1691450469697 has 2 divisors, whose sum is σ = 1691450469698. Its totient is φ = 1691450469696.

The previous prime is 1691450469671. The next prime is 1691450469719. The reversal of 1691450469697 is 7969640541961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1331695228081 + 359755241616 = 1153991^2 + 599796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1691450469697 is a prime.

It is a super-2 number, since 2×1691450469697² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1691450469607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845725234848 + 845725234849.

It is an arithmetic number, because the mean of its divisors is an integer number (845725234849).

Almost surely, 2^{1691450469697} is an apocalyptic number.

It is an amenable number.

1691450469697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691450469697 is an equidigital number, since it uses as much as digits as its factorization.

1691450469697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 1691450469697 in words is "one trillion, six hundred ninety-one billion, four hundred fifty million, four hundred sixty-nine thousand, six hundred ninety-seven".