8021684925 has 36 divisors (see below), whose sum is σ = 14863180020. Its totient is φ = 4130703360.

The previous prime is 8021684849. The next prime is 8021684929. The reversal of 8021684925 is 5294861208.

8021684925 is a `hidden beast` number, since 80 + 21 + 68 + 492 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 368409636 + 7653275289 = 19194^2 + 87483^2 .

It is not a de Polignac number, because 8021684925 - 2¹² = 8021680829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021684929) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 608164 + ... + 621213.

Almost surely, 2^8021684925 is an apocalyptic number.

It is an amenable number.

8021684925 is a deficient number, since it is larger than the sum of its proper divisors (6841495095).

8021684925 is a wasteful number, since it uses less digits than its factorization.

8021684925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229422 (or 1229414 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 8021684925 is about 89563.8594802613. The cubic root of 8021684925 is about 2001.8054467739.

The spelling of 8021684925 in words is "eight billion, twenty-one million, six hundred eighty-four thousand, nine hundred twenty-five".