204217115407 has 4 divisors (see below), whose sum is σ = 204218134360. Its totient is φ = 204216096456.

The previous prime is 204217115393. The next prime is 204217115411. The reversal of 204217115407 is 704511712402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 704511712402 = 2 ⋅352255856201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204217115407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204217115447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98157 + ... + 646582.

It is an arithmetic number, because the mean of its divisors is an integer number (51054533590).

Almost surely, 2^204217115407 is an apocalyptic number.

204217115407 is a deficient number, since it is larger than the sum of its proper divisors (1018953).

204217115407 is an equidigital number, since it uses as much as digits as its factorization.

204217115407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018952.

The product of its (nonzero) digits is 15680, while the sum is 34.

Adding to 204217115407 its reverse (704511712402), we get a palindrome (908728827809).

The spelling of 204217115407 in words is "two hundred four billion, two hundred seventeen million, one hundred fifteen thousand, four hundred seven".