665250667 has 4 divisors (see below), whose sum is σ = 700263880. Its totient is φ = 630237456.

The previous prime is 665250661. The next prime is 665250683. The reversal of 665250667 is 766052566.

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 665250667 - 2³ = 665250659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665250661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17506578 + ... + 17506615.

It is an arithmetic number, because the mean of its divisors is an integer number (175065970).

Almost surely, 2^665250667 is an apocalyptic number.

665250667 is a deficient number, since it is larger than the sum of its proper divisors (35013213).

665250667 is a wasteful number, since it uses less digits than its factorization.

665250667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35013212.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 665250667 is about 25792.4536831997. The cubic root of 665250667 is about 872.9615315012.

The spelling of 665250667 in words is "six hundred sixty-five million, two hundred fifty thousand, six hundred sixty-seven".