2385643969809 has 15 divisors (see below), whose sum is σ = 3563760523147. Its totient is φ = 1590420045888.

The previous prime is 2385643969781. The next prime is 2385643969817. The reversal of 2385643969809 is 9089693465832.

The square root of 2385643969809 is 1544553.

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

2385643969809 is a `hidden beast` number, since 2 + 3 + 8 + 56 + 439 + 69 + 80 + 9 = 666.

2385643969809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1822135518225 + 563508451584 = 1349865^2 + 750672^2 .

It is not a de Polignac number, because 2385643969809 - 2¹⁵ = 2385643937041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2385643969909) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 13815169 + ... + 13986785.

Almost surely, 2^{2385643969809} is an apocalyptic number.

2385643969809 is the 1544553-rd square number.

2385643969809 is the 772277-th centered octagonal number.

It is an amenable number.

2385643969809 is a deficient number, since it is larger than the sum of its proper divisors (1178116553338).

2385643969809 is an frugal number, since it uses more digits than its factorization.

2385643969809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343246 (or 171620 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 72.

The spelling of 2385643969809 in words is "two trillion, three hundred eighty-five billion, six hundred forty-three million, nine hundred sixty-nine thousand, eight hundred nine".