75657661 has 2 divisors, whose sum is σ = 75657662. Its totient is φ = 75657660.

The previous prime is 75657643. The next prime is 75657679. The reversal of 75657661 is 16675657.

It is a balanced prime because it is at equal distance from previous prime (75657643) and next prime (75657679).

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 32558436 = 6565^2 + 5706^2 .

It is a cyclic number.

It is not a de Polignac number, because 75657661 - 2⁹ = 75657149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75657641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37828830 + 37828831.

It is an arithmetic number, because the mean of its divisors is an integer number (37828831).

Almost surely, 2^75657661 is an apocalyptic number.

It is an amenable number.

75657661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75657661 is an equidigital number, since it uses as much as digits as its factorization.

75657661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 43.

The square root of 75657661 is about 8698.1412382187. The cubic root of 75657661 is about 422.9453977402.

The spelling of 75657661 in words is "seventy-five million, six hundred fifty-seven thousand, six hundred sixty-one".