205801044409 has 9 divisors (see below), whose sum is σ = 207443940069. Its totient is φ = 204171069180.

The previous prime is 205801044401. The next prime is 205801044419. The reversal of 205801044409 is 904440108502.

The square root of 205801044409 is 453653.

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

It is not a de Polignac number, because 205801044409 - 2³ = 205801044401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205801044401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 59426812 + ... + 59430274.

Almost surely, 2^205801044409 is an apocalyptic number.

205801044409 is the 453653-rd square number.

205801044409 is the 226827-th centered octagonal number.

It is an amenable number.

205801044409 is a deficient number, since it is larger than the sum of its proper divisors (1642895660).

205801044409 is an frugal number, since it uses more digits than its factorization.

205801044409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7188 (or 3594 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 205801044409 in words is "two hundred five billion, eight hundred one million, forty-four thousand, four hundred nine".