8145981773 has 4 divisors (see below), whose sum is σ = 8147559840. Its totient is φ = 8144403708.

The previous prime is 8145981761. The next prime is 8145981787. The reversal of 8145981773 is 3771895418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8145981773 - 2¹⁰ = 8145980749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8145981373) 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, 781265 + ... + 791622.

It is an arithmetic number, because the mean of its divisors is an integer number (2036889960).

Almost surely, 2^8145981773 is an apocalyptic number.

It is an amenable number.

8145981773 is a deficient number, since it is larger than the sum of its proper divisors (1578067).

8145981773 is a wasteful number, since it uses less digits than its factorization.

8145981773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578066.

The product of its digits is 1693440, while the sum is 53.

The square root of 8145981773 is about 90255.0927815157. The cubic root of 8145981773 is about 2012.0918934726.

The spelling of 8145981773 in words is "eight billion, one hundred forty-five million, nine hundred eighty-one thousand, seven hundred seventy-three".