201918444409 has 8 divisors (see below), whose sum is σ = 220348152000. Its totient is φ = 183500984400.

The previous prime is 201918444407. The next prime is 201918444421. The reversal of 201918444409 is 904444819102.

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

It is a cyclic number.

It is not a de Polignac number, because 201918444409 - 2¹ = 201918444407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201918444407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3027402 + ... + 3093379.

It is an arithmetic number, because the mean of its divisors is an integer number (27543519000).

Almost surely, 2^201918444409 is an apocalyptic number.

It is an amenable number.

201918444409 is a deficient number, since it is larger than the sum of its proper divisors (18429707591).

201918444409 is a wasteful number, since it uses less digits than its factorization.

201918444409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123791.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 201918444409 in words is "two hundred one billion, nine hundred eighteen million, four hundred forty-four thousand, four hundred nine".