668676897 has 16 divisors (see below), whose sum is σ = 1132151680. Its totient is φ = 382100976.

The previous prime is 668676859. The next prime is 668676917. The reversal of 668676897 is 798676866.

It is not a de Polignac number, because 668676897 - 2⁸ = 668676641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668676857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1768798 + ... + 1769175.

It is an arithmetic number, because the mean of its divisors is an integer number (70759480).

Almost surely, 2^668676897 is an apocalyptic number.

It is an amenable number.

668676897 is a deficient number, since it is larger than the sum of its proper divisors (463474783).

668676897 is a wasteful number, since it uses less digits than its factorization.

668676897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537989 (or 3537983 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The square root of 668676897 is about 25858.7876165918. The cubic root of 668676897 is about 874.4576326458.

The spelling of 668676897 in words is "six hundred sixty-eight million, six hundred seventy-six thousand, eight hundred ninety-seven".