75660509 has 2 divisors, whose sum is σ = 75660510. Its totient is φ = 75660508.

The previous prime is 75660461. The next prime is 75660517. The reversal of 75660509 is 90506657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 14273284 = 7835^2 + 3778^2 .

It is a cyclic number.

It is not a de Polignac number, because 75660509 - 2⁸ = 75660253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75660569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37830254 + 37830255.

It is an arithmetic number, because the mean of its divisors is an integer number (37830255).

Almost surely, 2^75660509 is an apocalyptic number.

It is an amenable number.

75660509 is a deficient number, since it is larger than the sum of its proper divisors (1).

75660509 is an equidigital number, since it uses as much as digits as its factorization.

75660509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 75660509 is about 8698.3049498164. The cubic root of 75660509 is about 422.9507046862.

The spelling of 75660509 in words is "seventy-five million, six hundred sixty thousand, five hundred nine".