75328661 has 2 divisors, whose sum is σ = 75328662. Its totient is φ = 75328660.

The previous prime is 75328613. The next prime is 75328679. The reversal of 75328661 is 16682357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45832900 + 29495761 = 6770^2 + 5431^2 .

It is an emirp because it is prime and its reverse (16682357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75328661 - 2¹⁴ = 75312277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75328601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37664330 + 37664331.

It is an arithmetic number, because the mean of its divisors is an integer number (37664331).

Almost surely, 2^75328661 is an apocalyptic number.

It is an amenable number.

75328661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75328661 is an equidigital number, since it uses as much as digits as its factorization.

75328661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 75328661 is about 8679.2085468665. The cubic root of 75328661 is about 422.3314426304.

The spelling of 75328661 in words is "seventy-five million, three hundred twenty-eight thousand, six hundred sixty-one".