6523521649 has 2 divisors, whose sum is σ = 6523521650. Its totient is φ = 6523521648.

The previous prime is 6523521607. The next prime is 6523521659. The reversal of 6523521649 is 9461253256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3812445025 + 2711076624 = 61745^2 + 52068^2 .

It is a cyclic number.

It is not a de Polignac number, because 6523521649 - 2³¹ = 4376038001 is a prime.

It is not a weakly prime, because it can be changed into another prime (6523521659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3261760824 + 3261760825.

It is an arithmetic number, because the mean of its divisors is an integer number (3261760825).

Almost surely, 2^6523521649 is an apocalyptic number.

It is an amenable number.

6523521649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6523521649 is an equidigital number, since it uses as much as digits as its factorization.

6523521649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The square root of 6523521649 is about 80768.3208256802. The cubic root of 6523521649 is about 1868.5040175940.

The spelling of 6523521649 in words is "six billion, five hundred twenty-three million, five hundred twenty-one thousand, six hundred forty-nine".