204308163491 has 8 divisors (see below), whose sum is σ = 204824277504. Its totient is φ = 203792622280.

The previous prime is 204308163481. The next prime is 204308163529. The reversal of 204308163491 is 194361803402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204308163491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204308163481) 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, 575606 + ... + 860196.

It is an arithmetic number, because the mean of its divisors is an integer number (25603034688).

Almost surely, 2^204308163491 is an apocalyptic number.

204308163491 is a deficient number, since it is larger than the sum of its proper divisors (516114013).

204308163491 is a wasteful number, since it uses less digits than its factorization.

204308163491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286401.

The product of its (nonzero) digits is 124416, while the sum is 41.

Adding to 204308163491 its reverse (194361803402), we get a palindrome (398669966893).

The spelling of 204308163491 in words is "two hundred four billion, three hundred eight million, one hundred sixty-three thousand, four hundred ninety-one".