85545661 has 2 divisors, whose sum is σ = 85545662. Its totient is φ = 85545660.

The previous prime is 85545641. The next prime is 85545697. The reversal of 85545661 is 16654558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59382436 + 26163225 = 7706^2 + 5115^2 .

It is a cyclic number.

It is not a de Polignac number, because 85545661 - 2¹¹ = 85543613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85545611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42772830 + 42772831.

It is an arithmetic number, because the mean of its divisors is an integer number (42772831).

Almost surely, 2^85545661 is an apocalyptic number.

It is an amenable number.

85545661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85545661 is an equidigital number, since it uses as much as digits as its factorization.

85545661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 40.

The square root of 85545661 is about 9249.0897389959. The cubic root of 85545661 is about 440.6218153853.

The spelling of 85545661 in words is "eighty-five million, five hundred forty-five thousand, six hundred sixty-one".