75000661 has 2 divisors, whose sum is σ = 75000662. Its totient is φ = 75000660.

The previous prime is 75000589. The next prime is 75000683. The reversal of 75000661 is 16600057.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 14394436 = 7785^2 + 3794^2 .

It is a cyclic number.

It is not a de Polignac number, because 75000661 - 2⁷ = 75000533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75003661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37500330 + 37500331.

It is an arithmetic number, because the mean of its divisors is an integer number (37500331).

Almost surely, 2^75000661 is an apocalyptic number.

It is an amenable number.

75000661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75000661 is an equidigital number, since it uses as much as digits as its factorization.

75000661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 75000661 is about 8660.2922006131. The cubic root of 75000661 is about 421.7175715561.

The spelling of 75000661 in words is "seventy-five million, six hundred sixty-one", and thus it is an aban number.