75665641 has 2 divisors, whose sum is σ = 75665642. Its totient is φ = 75665640.

The previous prime is 75665621. The next prime is 75665651. The reversal of 75665641 is 14656657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70913241 + 4752400 = 8421^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 75665641 - 2⁹ = 75665129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75665594 and 75665603.

It is not a weakly prime, because it can be changed into another prime (75665621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37832820 + 37832821.

It is an arithmetic number, because the mean of its divisors is an integer number (37832821).

Almost surely, 2^75665641 is an apocalyptic number.

It is an amenable number.

75665641 is a deficient number, since it is larger than the sum of its proper divisors (1).

75665641 is an equidigital number, since it uses as much as digits as its factorization.

75665641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 75665641 is about 8698.5999448187. The cubic root of 75665641 is about 422.9602672880.

The spelling of 75665641 in words is "seventy-five million, six hundred sixty-five thousand, six hundred forty-one".