1995417281549 has 2 divisors, whose sum is σ = 1995417281550. Its totient is φ = 1995417281548.

The previous prime is 1995417281497. The next prime is 1995417281593. The reversal of 1995417281549 is 9451827145991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1975028297449 + 20388984100 = 1405357^2 + 142790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995417281549 - 2⁸ = 1995417281293 is a prime.

It is a super-2 number, since 2×1995417281549² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1995417281449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997708640774 + 997708640775.

It is an arithmetic number, because the mean of its divisors is an integer number (997708640775).

Almost surely, 2^{1995417281549} is an apocalyptic number.

It is an amenable number.

1995417281549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995417281549 is an equidigital number, since it uses as much as digits as its factorization.

1995417281549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 65.

The spelling of 1995417281549 in words is "one trillion, nine hundred ninety-five billion, four hundred seventeen million, two hundred eighty-one thousand, five hundred forty-nine".