17946601945 has 4 divisors (see below), whose sum is σ = 21535922340. Its totient is φ = 14357281552.

The previous prime is 17946601931. The next prime is 17946601949. The reversal of 17946601945 is 54910664971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2268807424 + 15677794521 = 47632^2 + 125211^2 .

It is a cyclic number.

It is not a de Polignac number, because 17946601945 - 2⁹ = 17946601433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17946601892 and 17946601901.

It is not an unprimeable number, because it can be changed into a prime (17946601949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794660190 + ... + 1794660199.

It is an arithmetic number, because the mean of its divisors is an integer number (5383980585).

Almost surely, 2^17946601945 is an apocalyptic number.

It is an amenable number.

17946601945 is a deficient number, since it is larger than the sum of its proper divisors (3589320395).

17946601945 is an equidigital number, since it uses as much as digits as its factorization.

17946601945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589320394.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 17946601945 in words is "seventeen billion, nine hundred forty-six million, six hundred one thousand, nine hundred forty-five".