668847905 has 32 divisors (see below), whose sum is σ = 894395520. Its totient is φ = 476101120.

The previous prime is 668847901. The next prime is 668847917. The reversal of 668847905 is 509748866.

It is not a de Polignac number, because 668847905 - 2² = 668847901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668847901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 523127 + ... + 524403.

It is an arithmetic number, because the mean of its divisors is an integer number (27949860).

Almost surely, 2^668847905 is an apocalyptic number.

It is an amenable number.

668847905 is a deficient number, since it is larger than the sum of its proper divisors (225547615).

668847905 is a wasteful number, since it uses less digits than its factorization.

668847905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 668847905 is about 25862.0939794132. The cubic root of 668847905 is about 874.5321711390.

The spelling of 668847905 in words is "six hundred sixty-eight million, eight hundred forty-seven thousand, nine hundred five".