75663508321 has 2 divisors, whose sum is σ = 75663508322. Its totient is φ = 75663508320.

The previous prime is 75663508303. The next prime is 75663508351. The reversal of 75663508321 is 12380536657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68625137296 + 7038371025 = 261964^2 + 83895^2 .

It is an emirp because it is prime and its reverse (12380536657) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75663508321 - 2⁵ = 75663508289 is a prime.

It is not a weakly prime, because it can be changed into another prime (75663508301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37831754160 + 37831754161.

It is an arithmetic number, because the mean of its divisors is an integer number (37831754161).

Almost surely, 2^75663508321 is an apocalyptic number.

It is an amenable number.

75663508321 is a deficient number, since it is larger than the sum of its proper divisors (1).

75663508321 is an equidigital number, since it uses as much as digits as its factorization.

75663508321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 75663508321 in words is "seventy-five billion, six hundred sixty-three million, five hundred eight thousand, three hundred twenty-one".