1895849566997 has 2 divisors, whose sum is σ = 1895849566998. Its totient is φ = 1895849566996.

The previous prime is 1895849566987. The next prime is 1895849567041. The reversal of 1895849566997 is 7996659485981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1625214475921 + 270635091076 = 1274839^2 + 520226^2 .

It is a cyclic number.

It is not a de Polignac number, because 1895849566997 - 2²² = 1895845372693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1895849566927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947924783498 + 947924783499.

It is an arithmetic number, because the mean of its divisors is an integer number (947924783499).

Almost surely, 2^{1895849566997} is an apocalyptic number.

It is an amenable number.

1895849566997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1895849566997 is an equidigital number, since it uses as much as digits as its factorization.

1895849566997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10581580800, while the sum is 86.

The spelling of 1895849566997 in words is "one trillion, eight hundred ninety-five billion, eight hundred forty-nine million, five hundred sixty-six thousand, nine hundred ninety-seven".