666907007 has 4 divisors (see below), whose sum is σ = 718207560. Its totient is φ = 615606456.

The previous prime is 666907001. The next prime is 666907027. The reversal of 666907007 is 700709666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666907007 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 (666907001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25650257 + ... + 25650282.

It is an arithmetic number, because the mean of its divisors is an integer number (179551890).

Almost surely, 2^666907007 is an apocalyptic number.

666907007 is a deficient number, since it is larger than the sum of its proper divisors (51300553).

666907007 is a wasteful number, since it uses less digits than its factorization.

666907007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51300552.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 666907007 is about 25824.5427258645. The cubic root of 666907007 is about 873.6854304336.

The spelling of 666907007 in words is "six hundred sixty-six million, nine hundred seven thousand, seven".