209806303642 has 24 divisors (see below), whose sum is σ = 345448321884. Its totient is φ = 95507178624.

The previous prime is 209806303579. The next prime is 209806303667. The reversal of 209806303642 is 246303608902.

It can be written as a sum of positive squares in 6 ways, for example, as 49453309161 + 160352994481 = 222381^2 + 400441^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4226893 + ... + 4276240.

Almost surely, 2^209806303642 is an apocalyptic number.

209806303642 is a deficient number, since it is larger than the sum of its proper divisors (135642018242).

209806303642 is a wasteful number, since it uses less digits than its factorization.

209806303642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8503234 (or 8503221 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 209806303642 in words is "two hundred nine billion, eight hundred six million, three hundred three thousand, six hundred forty-two".