204115531201666 has 16 divisors (see below), whose sum is σ = 350145769752000. Its totient is φ = 87419727163440.

The previous prime is 204115531201661. The next prime is 204115531201667. The reversal of 204115531201666 is 666102135511402.

It is a super-2 number, since 2×204115531201666² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204115531201661) 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, 4863114705 + ... + 4863156676.

It is an arithmetic number, because the mean of its divisors is an integer number (21884110609500).

Almost surely, 2^{204115531201666} is an apocalyptic number.

204115531201666 is a deficient number, since it is larger than the sum of its proper divisors (146030238550334).

204115531201666 is a wasteful number, since it uses less digits than its factorization.

204115531201666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9726272889.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 204115531201666 in words is "two hundred four trillion, one hundred fifteen billion, five hundred thirty-one million, two hundred one thousand, six hundred sixty-six".