1945208805 has 16 divisors (see below), whose sum is σ = 3132161664. Its totient is φ = 1030835520.

The previous prime is 1945208779. The next prime is 1945208813. The reversal of 1945208805 is 5088025491.

It is a happy number.

1945208805 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1945208805 - 2⁸ = 1945208549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410641 + ... + 415350.

It is an arithmetic number, because the mean of its divisors is an integer number (195760104).

Almost surely, 2^1945208805 is an apocalyptic number.

1945208805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1945208805 is a deficient number, since it is larger than the sum of its proper divisors (1186952859).

1945208805 is a wasteful number, since it uses less digits than its factorization.

1945208805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826156.

The product of its (nonzero) digits is 115200, while the sum is 42.

The square root of 1945208805 is about 44104.5213668622. The cubic root of 1945208805 is about 1248.3089249772.

The spelling of 1945208805 in words is "one billion, nine hundred forty-five million, two hundred eight thousand, eight hundred five".