17820958949 has 2 divisors, whose sum is σ = 17820958950. Its totient is φ = 17820958948.

The previous prime is 17820958937. The next prime is 17820958973. The reversal of 17820958949 is 94985902871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16335396100 + 1485562849 = 127810^2 + 38543^2 .

It is a cyclic number.

It is not a de Polignac number, because 17820958949 - 2²⁸ = 17552523493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17820958891 and 17820958900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17820958979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8910479474 + 8910479475.

It is an arithmetic number, because the mean of its divisors is an integer number (8910479475).

Almost surely, 2^17820958949 is an apocalyptic number.

It is an amenable number.

17820958949 is a deficient number, since it is larger than the sum of its proper divisors (1).

17820958949 is an equidigital number, since it uses as much as digits as its factorization.

17820958949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 17820958949 in words is "seventeen billion, eight hundred twenty million, nine hundred fifty-eight thousand, nine hundred forty-nine".