204115531201555 has 8 divisors (see below), whose sum is σ = 244938750118992. Its totient is φ = 163292349843168.

The previous prime is 204115531201541. The next prime is 204115531201591. The reversal of 204115531201555 is 555102135511402.

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 204115531201555 - 2⁷ = 204115531201427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4409889 + ... + 20680381.

It is an arithmetic number, because the mean of its divisors is an integer number (30617343764874).

Almost surely, 2^{204115531201555} is an apocalyptic number.

204115531201555 is a deficient number, since it is larger than the sum of its proper divisors (40823218917437).

204115531201555 is a wasteful number, since it uses less digits than its factorization.

204115531201555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18779525.

The product of its (nonzero) digits is 150000, while the sum is 40.

Adding to 204115531201555 its reverse (555102135511402), we get a palindrome (759217666712957).

The spelling of 204115531201555 in words is "two hundred four trillion, one hundred fifteen billion, five hundred thirty-one million, two hundred one thousand, five hundred fifty-five".