85786661 has 2 divisors, whose sum is σ = 85786662. Its totient is φ = 85786660.

The previous prime is 85786651. The next prime is 85786663. The reversal of 85786661 is 16668758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84070561 + 1716100 = 9169^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 85786661 - 2²⁶ = 18677797 is a prime.

Together with 85786663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85786663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42893330 + 42893331.

It is an arithmetic number, because the mean of its divisors is an integer number (42893331).

Almost surely, 2^85786661 is an apocalyptic number.

It is an amenable number.

85786661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85786661 is an equidigital number, since it uses as much as digits as its factorization.

85786661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 85786661 is about 9262.1088851298. The cubic root of 85786661 is about 441.0352020001.

The spelling of 85786661 in words is "eighty-five million, seven hundred eighty-six thousand, six hundred sixty-one".