8721543945 has 16 divisors (see below), whose sum is σ = 13956305472. Its totient is φ = 4650878400.

The previous prime is 8721543893. The next prime is 8721543959. The reversal of 8721543945 is 5493451278.

It is not a de Polignac number, because 8721543945 - 2¹¹ = 8721541897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8721543894 and 8721543903.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94495 + ... + 162395.

It is an arithmetic number, because the mean of its divisors is an integer number (872269092).

Almost surely, 2^8721543945 is an apocalyptic number.

It is an amenable number.

8721543945 is a deficient number, since it is larger than the sum of its proper divisors (5234761527).

8721543945 is a wasteful number, since it uses less digits than its factorization.

8721543945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76472.

The product of its digits is 1209600, while the sum is 48.

The square root of 8721543945 is about 93389.2067907207. The cubic root of 8721543945 is about 2058.4064045189.

The spelling of 8721543945 in words is "eight billion, seven hundred twenty-one million, five hundred forty-three thousand, nine hundred forty-five".