17910899957 has 2 divisors, whose sum is σ = 17910899958. Its totient is φ = 17910899956.

The previous prime is 17910899939. The next prime is 17910900011. The reversal of 17910899957 is 75999801971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17496411076 + 414488881 = 132274^2 + 20359^2 .

It is a cyclic number.

It is not a de Polignac number, because 17910899957 - 2¹² = 17910895861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17910899893 and 17910899902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17910899857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8955449978 + 8955449979.

It is an arithmetic number, because the mean of its divisors is an integer number (8955449979).

Almost surely, 2^17910899957 is an apocalyptic number.

It is an amenable number.

17910899957 is a deficient number, since it is larger than the sum of its proper divisors (1).

17910899957 is an equidigital number, since it uses as much as digits as its factorization.

17910899957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12859560, while the sum is 65.

The spelling of 17910899957 in words is "seventeen billion, nine hundred ten million, eight hundred ninety-nine thousand, nine hundred fifty-seven".