6521671025 has 6 divisors (see below), whose sum is σ = 8086872102. Its totient is φ = 5217336800.

The previous prime is 6521671021. The next prime is 6521671033. The reversal of 6521671025 is 5201761256.

It can be written as a sum of positive squares in 3 ways, for example, as 584043889 + 5937627136 = 24167^2 + 77056^2 .

It is not a de Polignac number, because 6521671025 - 2² = 6521671021 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6521671021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130433396 + ... + 130433445.

It is an arithmetic number, because the mean of its divisors is an integer number (1347812017).

Almost surely, 2^6521671025 is an apocalyptic number.

It is an amenable number.

6521671025 is a deficient number, since it is larger than the sum of its proper divisors (1565201077).

6521671025 is a wasteful number, since it uses less digits than its factorization.

6521671025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260866851 (or 260866846 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 6521671025 is about 80756.8636401885. The cubic root of 6521671025 is about 1868.3273121476.

The spelling of 6521671025 in words is "six billion, five hundred twenty-one million, six hundred seventy-one thousand, twenty-five".