85665506 has 4 divisors (see below), whose sum is σ = 128498262. Its totient is φ = 42832752.

The previous prime is 85665469. The next prime is 85665521. The reversal of 85665506 is 60556658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60556658 = 2 ⋅30278329.

It can be written as a sum of positive squares in only one way, i.e., 44769481 + 40896025 = 6691^2 + 6395^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21416375 + ... + 21416378.

Almost surely, 2^85665506 is an apocalyptic number.

85665506 is a deficient number, since it is larger than the sum of its proper divisors (42832756).

85665506 is a wasteful number, since it uses less digits than its factorization.

85665506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42832755.

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 85665506 is about 9255.5662171474. The cubic root of 85665506 is about 440.8274820838.

The spelling of 85665506 in words is "eighty-five million, six hundred sixty-five thousand, five hundred six".