204653997769 has 81 divisors (see below), whose sum is σ = 248886493023. Its totient is φ = 168157676544.

The previous prime is 204653997767. The next prime is 204653997799. The reversal of 204653997769 is 967799356402.

The square root of 204653997769 is 452387.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 179468307769 + 25185690000 = 423637^2 + 158700^2 .

It is not a de Polignac number, because 204653997769 - 2¹ = 204653997767 is a prime.

It is a super-2 number, since 2×204653997769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204653997763) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2299483077 + ... + 2299483165.

Almost surely, 2^204653997769 is an apocalyptic number.

204653997769 is the 452387-th square number.

204653997769 is the 226194-th centered octagonal number.

It is an amenable number.

204653997769 is a deficient number, since it is larger than the sum of its proper divisors (44232495254).

204653997769 is an equidigital number, since it uses as much as digits as its factorization.

204653997769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 154314720, while the sum is 67.

The spelling of 204653997769 in words is "two hundred four billion, six hundred fifty-three million, nine hundred ninety-seven thousand, seven hundred sixty-nine".