1955198017349 has 2 divisors, whose sum is σ = 1955198017350. Its totient is φ = 1955198017348.

The previous prime is 1955198017321. The next prime is 1955198017351. The reversal of 1955198017349 is 9437108915591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1516764664900 + 438433352449 = 1231570^2 + 662143^2 .

It is a cyclic number.

It is not a de Polignac number, because 1955198017349 - 2¹⁶ = 1955197951813 is a prime.

Together with 1955198017351, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1955198017291 and 1955198017300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1955198017379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977599008674 + 977599008675.

It is an arithmetic number, because the mean of its divisors is an integer number (977599008675).

Almost surely, 2^{1955198017349} is an apocalyptic number.

It is an amenable number.

1955198017349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955198017349 is an equidigital number, since it uses as much as digits as its factorization.

1955198017349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 62.

The spelling of 1955198017349 in words is "one trillion, nine hundred fifty-five billion, one hundred ninety-eight million, seventeen thousand, three hundred forty-nine".