17955109897 has 2 divisors, whose sum is σ = 17955109898. Its totient is φ = 17955109896.

The previous prime is 17955109891. The next prime is 17955109903. The reversal of 17955109897 is 79890155971.

It is a balanced prime because it is at equal distance from previous prime (17955109891) and next prime (17955109903).

It can be written as a sum of positive squares in only one way, i.e., 13371684496 + 4583425401 = 115636^2 + 67701^2 .

It is an emirp because it is prime and its reverse (79890155971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17955109897 - 2³ = 17955109889 is a prime.

It is not a weakly prime, because it can be changed into another prime (17955109891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8977554948 + 8977554949.

It is an arithmetic number, because the mean of its divisors is an integer number (8977554949).

Almost surely, 2^17955109897 is an apocalyptic number.

It is an amenable number.

17955109897 is a deficient number, since it is larger than the sum of its proper divisors (1).

17955109897 is an equidigital number, since it uses as much as digits as its factorization.

17955109897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7144200, while the sum is 61.

The spelling of 17955109897 in words is "seventeen billion, nine hundred fifty-five million, one hundred nine thousand, eight hundred ninety-seven".