85668551 has 4 divisors (see below), whose sum is σ = 85833504. Its totient is φ = 85503600.

The previous prime is 85668547. The next prime is 85668553. The reversal of 85668551 is 15586658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85668551 - 2² = 85668547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85668553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81695 + ... + 82736.

It is an arithmetic number, because the mean of its divisors is an integer number (21458376).

Almost surely, 2^85668551 is an apocalyptic number.

85668551 is a deficient number, since it is larger than the sum of its proper divisors (164953).

85668551 is a wasteful number, since it uses less digits than its factorization.

85668551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164952.

The product of its digits is 288000, while the sum is 44.

The square root of 85668551 is about 9255.7307112945. The cubic root of 85668551 is about 440.8327051265.

The spelling of 85668551 in words is "eighty-five million, six hundred sixty-eight thousand, five hundred fifty-one".