85774159661 has 2 divisors, whose sum is σ = 85774159662. Its totient is φ = 85774159660.

The previous prime is 85774159637. The next prime is 85774159711. The reversal of 85774159661 is 16695147758.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80650320100 + 5123839561 = 283990^2 + 71581^2 .

It is a cyclic number.

It is not a de Polignac number, because 85774159661 - 2³⁴ = 68594290477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85774159661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85774159631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42887079830 + 42887079831.

It is an arithmetic number, because the mean of its divisors is an integer number (42887079831).

Almost surely, 2^85774159661 is an apocalyptic number.

It is an amenable number.

85774159661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85774159661 is an equidigital number, since it uses as much as digits as its factorization.

85774159661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 59.

The spelling of 85774159661 in words is "eighty-five billion, seven hundred seventy-four million, one hundred fifty-nine thousand, six hundred sixty-one".