2168903945 has 16 divisors (see below), whose sum is σ = 2967768720. Its totient is φ = 1507436544.

The previous prime is 2168903879. The next prime is 2168903969. The reversal of 2168903945 is 5493098612.

It can be written as a sum of positive squares in 8 ways, for example, as 118897216 + 2050006729 = 10904^2 + 45277^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168903945 - 2¹² = 2168899849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2168903945.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 980300 + ... + 982509.

It is an arithmetic number, because the mean of its divisors is an integer number (185485545).

Almost surely, 2^2168903945 is an apocalyptic number.

It is an amenable number.

2168903945 is a deficient number, since it is larger than the sum of its proper divisors (798864775).

2168903945 is a wasteful number, since it uses less digits than its factorization.

2168903945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962844.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 2168903945 is about 46571.4928362834. The cubic root of 2168903945 is about 1294.4345797162.

The spelling of 2168903945 in words is "two billion, one hundred sixty-eight million, nine hundred three thousand, nine hundred forty-five".