667407717 has 24 divisors (see below), whose sum is σ = 989148888. Its totient is φ = 433382400.

The previous prime is 667407691. The next prime is 667407817. The reversal of 667407717 is 717704766.

It can be written as a sum of positive squares in 4 ways, for example, as 2232036 + 665175681 = 1494^2 + 25791^2 .

It is not a de Polignac number, because 667407717 - 2⁷ = 667407589 is a prime.

It is a super-2 number, since 2×667407717² = 890866121422304178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667407017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324063 + ... + 326115.

It is an arithmetic number, because the mean of its divisors is an integer number (41214537).

Almost surely, 2^667407717 is an apocalyptic number.

It is an amenable number.

667407717 is a deficient number, since it is larger than the sum of its proper divisors (321741171).

667407717 is a wasteful number, since it uses less digits than its factorization.

667407717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981 (or 2978 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 45.

The square root of 667407717 is about 25834.2353670473. The cubic root of 667407717 is about 873.9040284247.

The spelling of 667407717 in words is "six hundred sixty-seven million, four hundred seven thousand, seven hundred seventeen".