825381709385 has 4 divisors (see below), whose sum is σ = 990458051268. Its totient is φ = 660305367504.

The previous prime is 825381709367. The next prime is 825381709391. The reversal of 825381709385 is 583907183528.

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

It can be written as a sum of positive squares in 2 ways, for example, as 584313475216 + 241068234169 = 764404^2 + 490987^2 .

It is a cyclic number.

It is not a de Polignac number, because 825381709385 - 2²⁶ = 825314600521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82538170934 + ... + 82538170943.

It is an arithmetic number, because the mean of its divisors is an integer number (247614512817).

Almost surely, 2^825381709385 is an apocalyptic number.

It is an amenable number.

825381709385 is a deficient number, since it is larger than the sum of its proper divisors (165076341883).

825381709385 is a wasteful number, since it uses less digits than its factorization.

825381709385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165076341882.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 825381709385 in words is "eight hundred twenty-five billion, three hundred eighty-one million, seven hundred nine thousand, three hundred eighty-five".