667512007 has 4 divisors (see below), whose sum is σ = 667670256. Its totient is φ = 667353760.

The previous prime is 667511993. The next prime is 667512037. The reversal of 667512007 is 700215766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 700215766 = 2 ⋅350107883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667512007 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 (667512037) 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 3 ways as a sum of consecutive naturals, for example, 72619 + ... + 81292.

It is an arithmetic number, because the mean of its divisors is an integer number (166917564).

Almost surely, 2^667512007 is an apocalyptic number.

667512007 is a deficient number, since it is larger than the sum of its proper divisors (158249).

667512007 is a wasteful number, since it uses less digits than its factorization.

667512007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158248.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 667512007 is about 25836.2537338524. The cubic root of 667512007 is about 873.9495451816.

The spelling of 667512007 in words is "six hundred sixty-seven million, five hundred twelve thousand, seven".