7664125321 has 2 divisors, whose sum is σ = 7664125322. Its totient is φ = 7664125320.

The previous prime is 7664125309. The next prime is 7664125327. The reversal of 7664125321 is 1235214667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7146335296 + 517790025 = 84536^2 + 22755^2 .

It is a cyclic number.

It is not a de Polignac number, because 7664125321 - 2²⁵ = 7630570889 is a prime.

It is not a weakly prime, because it can be changed into another prime (7664125327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832062660 + 3832062661.

It is an arithmetic number, because the mean of its divisors is an integer number (3832062661).

Almost surely, 2^7664125321 is an apocalyptic number.

It is an amenable number.

7664125321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7664125321 is an equidigital number, since it uses as much as digits as its factorization.

7664125321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 7664125321 is about 87544.9902678617. The cubic root of 7664125321 is about 1971.6093354775.

Adding to 7664125321 its reverse (1235214667), we get a palindrome (8899339988).

The spelling of 7664125321 in words is "seven billion, six hundred sixty-four million, one hundred twenty-five thousand, three hundred twenty-one".