6521669325 has 18 divisors (see below), whose sum is σ = 11681034794. Its totient is φ = 3478223520.

The previous prime is 6521669317. The next prime is 6521669327. The reversal of 6521669325 is 5239661256.

It can be written as a sum of positive squares in 3 ways, for example, as 2883204 + 6518786121 = 1698^2 + 80739^2 .

It is not a de Polignac number, because 6521669325 - 2³ = 6521669317 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521669327) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14492374 + ... + 14492823.

Almost surely, 2^6521669325 is an apocalyptic number.

It is an amenable number.

6521669325 is a deficient number, since it is larger than the sum of its proper divisors (5159365469).

6521669325 is a wasteful number, since it uses less digits than its factorization.

6521669325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28985213 (or 28985205 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 6521669325 is about 80756.8531147667. The cubic root of 6521669325 is about 1868.3271498090.

The spelling of 6521669325 in words is "six billion, five hundred twenty-one million, six hundred sixty-nine thousand, three hundred twenty-five".