201809137696 has 12 divisors (see below), whose sum is σ = 397311739902. Its totient is φ = 100904568832.

The previous prime is 201809137679. The next prime is 201809137709. The reversal of 201809137696 is 696731908102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 125290513296 + 76518624400 = 353964^2 + 276620^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3153267745 + ... + 3153267808.

Almost surely, 2^201809137696 is an apocalyptic number.

It is an amenable number.

201809137696 is a deficient number, since it is larger than the sum of its proper divisors (195502602206).

201809137696 is an equidigital number, since it uses as much as digits as its factorization.

201809137696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6306535563 (or 6306535555 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 201809137696 in words is "two hundred one billion, eight hundred nine million, one hundred thirty-seven thousand, six hundred ninety-six".