668496887 has 4 divisors (see below), whose sum is σ = 668711400. Its totient is φ = 668282376.

The previous prime is 668496869. The next prime is 668496901. The reversal of 668496887 is 788694866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788694866 = 2 ⋅394347433.

It is a cyclic number.

It is not a de Polignac number, because 668496887 - 2⁶ = 668496823 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 (668496847) 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, 102512 + ... + 108837.

It is an arithmetic number, because the mean of its divisors is an integer number (167177850).

Almost surely, 2^668496887 is an apocalyptic number.

668496887 is a deficient number, since it is larger than the sum of its proper divisors (214513).

668496887 is a wasteful number, since it uses less digits than its factorization.

668496887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214512.

The product of its digits is 27869184, while the sum is 62.

The square root of 668496887 is about 25855.3067473585. The cubic root of 668496887 is about 874.3791566552.

The spelling of 668496887 in words is "six hundred sixty-eight million, four hundred ninety-six thousand, eight hundred eighty-seven".