668400085 has 16 divisors (see below), whose sum is σ = 822934080. Its totient is φ = 520979200.

The previous prime is 668400077. The next prime is 668400133. The reversal of 668400085 is 580004866.

It is not a de Polignac number, because 668400085 - 2³ = 668400077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23310 + ... + 43360.

It is an arithmetic number, because the mean of its divisors is an integer number (51433380).

Almost surely, 2^668400085 is an apocalyptic number.

It is an amenable number.

668400085 is a deficient number, since it is larger than the sum of its proper divisors (154533995).

668400085 is a wasteful number, since it uses less digits than its factorization.

668400085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20228.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 668400085 is about 25853.4346847764. The cubic root of 668400085 is about 874.3369496588.

The spelling of 668400085 in words is "six hundred sixty-eight million, four hundred thousand, eighty-five".