87666617 has 2 divisors, whose sum is σ = 87666618. Its totient is φ = 87666616.

The previous prime is 87666587. The next prime is 87666647. The reversal of 87666617 is 71666678.

It is a balanced prime because it is at equal distance from previous prime (87666587) and next prime (87666647).

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 4145296 = 9139^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 87666617 - 2¹² = 87662521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87666647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43833308 + 43833309.

It is an arithmetic number, because the mean of its divisors is an integer number (43833309).

Almost surely, 2^87666617 is an apocalyptic number.

It is an amenable number.

87666617 is a deficient number, since it is larger than the sum of its proper divisors (1).

87666617 is an equidigital number, since it uses as much as digits as its factorization.

87666617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 87666617 is about 9363.0452845215. The cubic root of 87666617 is about 444.2336124869.

The spelling of 87666617 in words is "eighty-seven million, six hundred sixty-six thousand, six hundred seventeen".