8721518003 has 4 divisors (see below), whose sum is σ = 9514383288. Its totient is φ = 7928652720.

The previous prime is 8721517993. The next prime is 8721518023. The reversal of 8721518003 is 3008151278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8721518003 - 2⁸ = 8721517747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721518023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396432626 + ... + 396432647.

It is an arithmetic number, because the mean of its divisors is an integer number (2378595822).

Almost surely, 2^8721518003 is an apocalyptic number.

8721518003 is a deficient number, since it is larger than the sum of its proper divisors (792865285).

8721518003 is a wasteful number, since it uses less digits than its factorization.

8721518003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792865284.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 8721518003 is about 93389.0678987643. The cubic root of 8721518003 is about 2058.4043636252.

The spelling of 8721518003 in words is "eight billion, seven hundred twenty-one million, five hundred eighteen thousand, three".