8145779521 has 24 divisors (see below), whose sum is σ = 9609989760. Its totient is φ = 6838893600.

The previous prime is 8145779501. The next prime is 8145779531. The reversal of 8145779521 is 1259775418.

It is not a de Polignac number, because 8145779521 - 2¹¹ = 8145777473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8145779501) 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 23 ways as a sum of consecutive naturals, for example, 144616 + ... + 192886.

It is an arithmetic number, because the mean of its divisors is an integer number (400416240).

Almost surely, 2^8145779521 is an apocalyptic number.

It is an amenable number.

8145779521 is a deficient number, since it is larger than the sum of its proper divisors (1464210239).

8145779521 is a wasteful number, since it uses less digits than its factorization.

8145779521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48357 (or 48334 counting only the distinct ones).

The product of its digits is 705600, while the sum is 49.

The square root of 8145779521 is about 90253.9723280920. The cubic root of 8145779521 is about 2012.0752409687.

The spelling of 8145779521 in words is "eight billion, one hundred forty-five million, seven hundred seventy-nine thousand, five hundred twenty-one".