667709975 has 24 divisors (see below), whose sum is σ = 844440000. Its totient is φ = 523635840.

The previous prime is 667709947. The next prime is 667709983. The reversal of 667709975 is 579907766.

It is not a de Polignac number, because 667709975 - 2¹⁴ = 667693591 is a prime.

It is a super-3 number, since 3×667709975³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 667709975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 293141 + ... + 295409.

It is an arithmetic number, because the mean of its divisors is an integer number (35185000).

Almost surely, 2^667709975 is an apocalyptic number.

667709975 is a deficient number, since it is larger than the sum of its proper divisors (176730025).

667709975 is a wasteful number, since it uses less digits than its factorization.

667709975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 5000940, while the sum is 56.

The square root of 667709975 is about 25840.0846554341. The cubic root of 667709975 is about 874.0359341107.

The spelling of 667709975 in words is "six hundred sixty-seven million, seven hundred nine thousand, nine hundred seventy-five".