671216773 has 4 divisors (see below), whose sum is σ = 672535980. Its totient is φ = 669897568.

The previous prime is 671216761. The next prime is 671216779. The reversal of 671216773 is 377612176.

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 481934209 + 189282564 = 21953^2 + 13758^2 .

It is a cyclic number.

It is not a de Polignac number, because 671216773 - 2⁹ = 671216261 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 (671216779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658840 + ... + 659857.

It is an arithmetic number, because the mean of its divisors is an integer number (168133995).

Almost surely, 2^671216773 is an apocalyptic number.

It is an amenable number.

671216773 is a deficient number, since it is larger than the sum of its proper divisors (1319207).

671216773 is a wasteful number, since it uses less digits than its factorization.

671216773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319206.

The product of its digits is 74088, while the sum is 40.

The square root of 671216773 is about 25907.8515705182. The cubic root of 671216773 is about 875.5634022697.

The spelling of 671216773 in words is "six hundred seventy-one million, two hundred sixteen thousand, seven hundred seventy-three".