209009779898 has 8 divisors (see below), whose sum is σ = 313538819808. Its totient is φ = 104496839964.

The previous prime is 209009779873. The next prime is 209009779921. The reversal of 209009779898 is 898977900902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3992486 + ... + 4044497.

It is an arithmetic number, because the mean of its divisors is an integer number (39192352476).

Almost surely, 2^209009779898 is an apocalyptic number.

209009779898 is a deficient number, since it is larger than the sum of its proper divisors (104529039910).

209009779898 is a wasteful number, since it uses less digits than its factorization.

209009779898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049988.

The product of its (nonzero) digits is 41150592, while the sum is 68.

The spelling of 209009779898 in words is "two hundred nine billion, nine million, seven hundred seventy-nine thousand, eight hundred ninety-eight".