1669097071897 has 2 divisors, whose sum is σ = 1669097071898. Its totient is φ = 1669097071896.

The previous prime is 1669097071801. The next prime is 1669097071913. The reversal of 1669097071897 is 7981707909661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1238388383241 + 430708688656 = 1112829^2 + 656284^2 .

It is an emirp because it is prime and its reverse (7981707909661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669097071897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669097071997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834548535948 + 834548535949.

It is an arithmetic number, because the mean of its divisors is an integer number (834548535949).

Almost surely, 2^{1669097071897} is an apocalyptic number.

It is an amenable number.

1669097071897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669097071897 is an equidigital number, since it uses as much as digits as its factorization.

1669097071897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72013536, while the sum is 70.

The spelling of 1669097071897 in words is "one trillion, six hundred sixty-nine billion, ninety-seven million, seventy-one thousand, eight hundred ninety-seven".