75661517 has 2 divisors, whose sum is σ = 75661518. Its totient is φ = 75661516.

The previous prime is 75661471. The next prime is 75661549. The reversal of 75661517 is 71516657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44903401 + 30758116 = 6701^2 + 5546^2 .

It is a cyclic number.

It is not a de Polignac number, because 75661517 - 2¹⁴ = 75645133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75660517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37830758 + 37830759.

It is an arithmetic number, because the mean of its divisors is an integer number (37830759).

Almost surely, 2^75661517 is an apocalyptic number.

It is an amenable number.

75661517 is a deficient number, since it is larger than the sum of its proper divisors (1).

75661517 is an equidigital number, since it uses as much as digits as its factorization.

75661517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44100, while the sum is 38.

The square root of 75661517 is about 8698.3628919470. The cubic root of 75661517 is about 422.9525829555.

The spelling of 75661517 in words is "seventy-five million, six hundred sixty-one thousand, five hundred seventeen".