204126303541661 has 8 divisors (see below), whose sum is σ = 204153469942848. Its totient is φ = 204099137784000.

The previous prime is 204126303541621. The next prime is 204126303541663. The reversal of 204126303541661 is 166145303621402.

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 204126303541661 - 2¹⁸ = 204126303279517 is a prime.

It is a super-2 number, since 2×204126303541661² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204126303541663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1290544421 + ... + 1290702581.

It is an arithmetic number, because the mean of its divisors is an integer number (25519183742856).

Almost surely, 2^{204126303541661} is an apocalyptic number.

It is an amenable number.

204126303541661 is a deficient number, since it is larger than the sum of its proper divisors (27166401187).

204126303541661 is a wasteful number, since it uses less digits than its factorization.

204126303541661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321763.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 204126303541661 in words is "two hundred four trillion, one hundred twenty-six billion, three hundred three million, five hundred forty-one thousand, six hundred sixty-one".