1673316661 has 4 divisors (see below), whose sum is σ = 1688668300. Its totient is φ = 1657965024.

The previous prime is 1673316649. The next prime is 1673316691. The reversal of 1673316661 is 1666133761.

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 1278062500 + 395254161 = 35750^2 + 19881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1673316661 - 2¹¹ = 1673314613 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 (1673316691) 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, 7675656 + ... + 7675873.

It is an arithmetic number, because the mean of its divisors is an integer number (422167075).

Almost surely, 2^1673316661 is an apocalyptic number.

It is an amenable number.

1673316661 is a deficient number, since it is larger than the sum of its proper divisors (15351639).

1673316661 is a wasteful number, since it uses less digits than its factorization.

1673316661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15351638.

The product of its digits is 81648, while the sum is 40.

The square root of 1673316661 is about 40906.1934308241. The cubic root of 1673316661 is about 1187.2058968953.

The spelling of 1673316661 in words is "one billion, six hundred seventy-three million, three hundred sixteen thousand, six hundred sixty-one".