85085389636 has 45 divisors (see below), whose sum is σ = 161494414571. Its totient is φ = 39224675568.

The previous prime is 85085389601. The next prime is 85085389639. The reversal of 85085389636 is 63698358058.

The square root of 85085389636 is 291694.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 42186695236 + 42898694400 = 205394^2 + 207120^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85085389639) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 98592141 + ... + 98593003.

Almost surely, 2^85085389636 is an apocalyptic number.

85085389636 is the 291694-th square number.

It is an amenable number.

85085389636 is a deficient number, since it is larger than the sum of its proper divisors (76409024935).

85085389636 is an frugal number, since it uses more digits than its factorization.

85085389636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

It can be divided in two parts, 85085 and 389636, that added together give a square (474721 = 689²).

The spelling of 85085389636 in words is "eighty-five billion, eighty-five million, three hundred eighty-nine thousand, six hundred thirty-six".