668894625 has 128 divisors (see below), whose sum is σ = 1476034560. Its totient is φ = 292248000.

The previous prime is 668894617. The next prime is 668894641. The reversal of 668894625 is 526498866.

It is a happy number.

668894625 is a `hidden beast` number, since 6 + 6 + 8 + 8 + 9 + 4 + 625 = 666.

It is not a de Polignac number, because 668894625 - 2³ = 668894617 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 542760 + ... + 543990.

It is an arithmetic number, because the mean of its divisors is an integer number (11531520).

Almost surely, 2^668894625 is an apocalyptic number.

It is an amenable number.

668894625 is an abundant number, since it is smaller than the sum of its proper divisors (807139935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668894625 is a wasteful number, since it uses less digits than its factorization.

668894625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285 (or 1269 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 668894625 is about 25862.9972161001. The cubic root of 668894625 is about 874.5525331134.

The spelling of 668894625 in words is "six hundred sixty-eight million, eight hundred ninety-four thousand, six hundred twenty-five".