1673356945 has 8 divisors (see below), whose sum is σ = 2162492136. Its totient is φ = 1235709696.

The previous prime is 1673356939. The next prime is 1673356957. The reversal of 1673356945 is 5496533761.

1673356945 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 373610241 + 1299746704 = 19329^2 + 36052^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1673356945 - 2²⁵ = 1639802513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12871912 + ... + 12872041.

It is an arithmetic number, because the mean of its divisors is an integer number (270311517).

Almost surely, 2^1673356945 is an apocalyptic number.

It is an amenable number.

1673356945 is a deficient number, since it is larger than the sum of its proper divisors (489135191).

1673356945 is a wasteful number, since it uses less digits than its factorization.

1673356945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25743971.

The product of its digits is 2041200, while the sum is 49.

The square root of 1673356945 is about 40906.6858227356. The cubic root of 1673356945 is about 1187.2154238863.

The spelling of 1673356945 in words is "one billion, six hundred seventy-three million, three hundred fifty-six thousand, nine hundred forty-five".