209193315872 has 12 divisors (see below), whose sum is σ = 411849340686. Its totient is φ = 104596657920.

The previous prime is 209193315847. The next prime is 209193315889. The reversal of 209193315872 is 278513391902.

It can be written as a sum of positive squares in only one way, i.e., 192408558736 + 16784757136 = 438644^2 + 129556^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209193315872.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3268645529 + ... + 3268645592.

Almost surely, 2^209193315872 is an apocalyptic number.

It is an amenable number.

209193315872 is a deficient number, since it is larger than the sum of its proper divisors (202656024814).

209193315872 is an equidigital number, since it uses as much as digits as its factorization.

209193315872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6537291131 (or 6537291123 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 209193315872 in words is "two hundred nine billion, one hundred ninety-three million, three hundred fifteen thousand, eight hundred seventy-two".