8421671825 has 24 divisors (see below), whose sum is σ = 11942985600. Its totient is φ = 5770857600.

The previous prime is 8421671767. The next prime is 8421671849. The reversal of 8421671825 is 5281761248.

It is not a de Polignac number, because 8421671825 - 2⁸ = 8421671569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248501 + ... + 280349.

It is an arithmetic number, because the mean of its divisors is an integer number (497624400).

Almost surely, 2^8421671825 is an apocalyptic number.

It is an amenable number.

8421671825 is a deficient number, since it is larger than the sum of its proper divisors (3521313775).

8421671825 is a wasteful number, since it uses less digits than its factorization.

8421671825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33377 (or 33372 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The square root of 8421671825 is about 91769.6672381457. The cubic root of 8421671825 is about 2034.5393999688.

The spelling of 8421671825 in words is "eight billion, four hundred twenty-one million, six hundred seventy-one thousand, eight hundred twenty-five".