204263076561 has 12 divisors (see below), whose sum is σ = 275187492432. Its totient is φ = 134771495808.

The previous prime is 204263076559. The next prime is 204263076571. The reversal of 204263076561 is 165670362402.

It is not a de Polignac number, because 204263076561 - 2¹ = 204263076559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204263076571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3589995 + ... + 3646448.

It is an arithmetic number, because the mean of its divisors is an integer number (22932291036).

Almost surely, 2^204263076561 is an apocalyptic number.

It is an amenable number.

204263076561 is a deficient number, since it is larger than the sum of its proper divisors (70924415871).

204263076561 is an frugal number, since it uses more digits than its factorization.

204263076561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236640 (or 7236543 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 204263076561 in words is "two hundred four billion, two hundred sixty-three million, seventy-six thousand, five hundred sixty-one".