667776673 has 4 divisors (see below), whose sum is σ = 689317888. Its totient is φ = 646235460.

The previous prime is 667776671. The next prime is 667776731. The reversal of 667776673 is 376677766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667776673 - 2¹ = 667776671 is a prime.

It is a super-3 number, since 3×667776673³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667776671) 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, 10770561 + ... + 10770622.

It is an arithmetic number, because the mean of its divisors is an integer number (172329472).

Almost surely, 2^667776673 is an apocalyptic number.

It is an amenable number.

667776673 is a deficient number, since it is larger than the sum of its proper divisors (21541215).

667776673 is a wasteful number, since it uses less digits than its factorization.

667776673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21541214.

The product of its digits is 9335088, while the sum is 55.

The square root of 667776673 is about 25841.3752149532. The cubic root of 667776673 is about 874.0650358215.

The spelling of 667776673 in words is "six hundred sixty-seven million, seven hundred seventy-six thousand, six hundred seventy-three".