668795247 has 6 divisors (see below), whose sum is σ = 966037592. Its totient is φ = 445863492.

The previous prime is 668795243. The next prime is 668795251. The reversal of 668795247 is 742597866.

It is an interprime number because it is at equal distance from previous prime (668795243) and next prime (668795251).

It is not a de Polignac number, because 668795247 - 2² = 668795243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668795193 and 668795202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668795243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37155283 + ... + 37155300.

Almost surely, 2^668795247 is an apocalyptic number.

668795247 is a deficient number, since it is larger than the sum of its proper divisors (297242345).

668795247 is a wasteful number, since it uses less digits than its factorization.

668795247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74310589 (or 74310586 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 668795247 is about 25861.0759056927. The cubic root of 668795247 is about 874.5092200698.

The spelling of 668795247 in words is "six hundred sixty-eight million, seven hundred ninety-five thousand, two hundred forty-seven".