676667665 has 4 divisors (see below), whose sum is σ = 812001204. Its totient is φ = 541334128.

The previous prime is 676667647. The next prime is 676667669. The reversal of 676667665 is 566766676.

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

It can be written as a sum of positive squares in 2 ways, for example, as 403889409 + 272778256 = 20097^2 + 16516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676667665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (676667669) 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, 67666762 + ... + 67666771.

It is an arithmetic number, because the mean of its divisors is an integer number (203000301).

Almost surely, 2^676667665 is an apocalyptic number.

It is an amenable number.

676667665 is a deficient number, since it is larger than the sum of its proper divisors (135333539).

676667665 is a wasteful number, since it uses less digits than its factorization.

676667665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135333538.

The product of its digits is 11430720, while the sum is 55.

The square root of 676667665 is about 26012.8365427533. The cubic root of 676667665 is about 877.9271394993.

The spelling of 676667665 in words is "six hundred seventy-six million, six hundred sixty-seven thousand, six hundred sixty-five".