825757825821 has 16 divisors (see below), whose sum is σ = 1124608313088. Its totient is φ = 538709864000.

The previous prime is 825757825817. The next prime is 825757825859. The reversal of 825757825821 is 128528757528.

It is not a de Polignac number, because 825757825821 - 2² = 825757825817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825757827821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482971 + ... + 1372871.

It is an arithmetic number, because the mean of its divisors is an integer number (70288019568).

Almost surely, 2^825757825821 is an apocalyptic number.

It is an amenable number.

825757825821 is a deficient number, since it is larger than the sum of its proper divisors (298850487267).

825757825821 is a wasteful number, since it uses less digits than its factorization.

825757825821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896532.

The product of its digits is 25088000, while the sum is 60.

The spelling of 825757825821 in words is "eight hundred twenty-five billion, seven hundred fifty-seven million, eight hundred twenty-five thousand, eight hundred twenty-one".