1808196545 has 8 divisors (see below), whose sum is σ = 2244657960. Its totient is φ = 1396675840.

The previous prime is 1808196539. The next prime is 1808196557. The reversal of 1808196545 is 5456918081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 406143409 + 1402053136 = 20153^2 + 37444^2 .

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

It is not a de Polignac number, because 1808196545 - 2⁴ = 1808196529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1808196545.

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, 6235016 + ... + 6235305.

It is an arithmetic number, because the mean of its divisors is an integer number (280582245).

Almost surely, 2^1808196545 is an apocalyptic number.

It is an amenable number.

1808196545 is a deficient number, since it is larger than the sum of its proper divisors (436461415).

1808196545 is a wasteful number, since it uses less digits than its factorization.

1808196545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12470355.

The product of its (nonzero) digits is 345600, while the sum is 47.

The square root of 1808196545 is about 42522.8943629194. The cubic root of 1808196545 is about 1218.2840125346.

The spelling of 1808196545 in words is "one billion, eight hundred eight million, one hundred ninety-six thousand, five hundred forty-five".