17900820097 has 2 divisors, whose sum is σ = 17900820098. Its totient is φ = 17900820096.

The previous prime is 17900820083. The next prime is 17900820101. The reversal of 17900820097 is 79002800971.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9117194256 + 8783625841 = 95484^2 + 93721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17900820097 is a prime.

It is not a weakly prime, because it can be changed into another prime (17900890097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8950410048 + 8950410049.

It is an arithmetic number, because the mean of its divisors is an integer number (8950410049).

Almost surely, 2^17900820097 is an apocalyptic number.

It is an amenable number.

17900820097 is a deficient number, since it is larger than the sum of its proper divisors (1).

17900820097 is an equidigital number, since it uses as much as digits as its factorization.

17900820097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The spelling of 17900820097 in words is "seventeen billion, nine hundred million, eight hundred twenty thousand, ninety-seven".