6521630161 has 2 divisors, whose sum is σ = 6521630162. Its totient is φ = 6521630160.

The previous prime is 6521630147. The next prime is 6521630173. The reversal of 6521630161 is 1610361256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4717079761 + 1804550400 = 68681^2 + 42480^2 .

It is a cyclic number.

It is not a de Polignac number, because 6521630161 - 2¹⁹ = 6521105873 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (6521631161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260815080 + 3260815081.

It is an arithmetic number, because the mean of its divisors is an integer number (3260815081).

Almost surely, 2^6521630161 is an apocalyptic number.

It is an amenable number.

6521630161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6521630161 is an equidigital number, since it uses as much as digits as its factorization.

6521630161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6521630161 is about 80756.6106334336. The cubic root of 6521630161 is about 1868.3234099020.

The spelling of 6521630161 in words is "six billion, five hundred twenty-one million, six hundred thirty thousand, one hundred sixty-one".