204653653261 has 4 divisors (see below), whose sum is σ = 204676582300. Its totient is φ = 204630724224.

The previous prime is 204653653249. The next prime is 204653653273. The reversal of 204653653261 is 162356356402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (204653653249) and next prime (204653653273).

It can be written as a sum of positive squares in 2 ways, for example, as 23964897636 + 180688755625 = 154806^2 + 425075^2 .

It is a cyclic number.

It is not a de Polignac number, because 204653653261 - 2⁷ = 204653653133 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 (204653650261) 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, 11451126 + ... + 11468983.

It is an arithmetic number, because the mean of its divisors is an integer number (51169145575).

Almost surely, 2^204653653261 is an apocalyptic number.

It is an amenable number.

204653653261 is a deficient number, since it is larger than the sum of its proper divisors (22929039).

204653653261 is an equidigital number, since it uses as much as digits as its factorization.

204653653261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22929038.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 204653653261 in words is "two hundred four billion, six hundred fifty-three million, six hundred fifty-three thousand, two hundred sixty-one".