2518487721 has 12 divisors (see below), whose sum is σ = 3772549872. Its totient is φ = 1678991652.

The previous prime is 2518487681. The next prime is 2518487731. The reversal of 2518487721 is 1277848152.

2518487721 is a `hidden beast` number, since 2 + 518 + 48 + 77 + 21 = 666.

It is not a de Polignac number, because 2518487721 - 2¹⁰ = 2518486697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2518487731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5181831 + ... + 5182316.

It is an arithmetic number, because the mean of its divisors is an integer number (314379156).

Almost surely, 2^2518487721 is an apocalyptic number.

It is an amenable number.

2518487721 is a deficient number, since it is larger than the sum of its proper divisors (1254062151).

2518487721 is an equidigital number, since it uses as much as digits as its factorization.

2518487721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10364162 (or 10364150 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 2518487721 is about 50184.5366721663. The cubic root of 2518487721 is about 1360.5461548144.

The spelling of 2518487721 in words is "two billion, five hundred eighteen million, four hundred eighty-seven thousand, seven hundred twenty-one".