667305715 has 4 divisors (see below), whose sum is σ = 800766864. Its totient is φ = 533844568.

The previous prime is 667305701. The next prime is 667305731. The reversal of 667305715 is 517503766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667305715 - 2¹³ = 667297523 is a prime.

It is a super-3 number, since 3×667305715³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 66730567 + ... + 66730576.

It is an arithmetic number, because the mean of its divisors is an integer number (200191716).

Almost surely, 2^667305715 is an apocalyptic number.

667305715 is a deficient number, since it is larger than the sum of its proper divisors (133461149).

667305715 is a wasteful number, since it uses less digits than its factorization.

667305715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133461148.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 667305715 is about 25832.2611282869. The cubic root of 667305715 is about 873.8595056650.

The spelling of 667305715 in words is "six hundred sixty-seven million, three hundred five thousand, seven hundred fifteen".