7518316521 has 32 divisors (see below), whose sum is σ = 11139897600. Its totient is φ = 4486068224.

The previous prime is 7518316513. The next prime is 7518316543. The reversal of 7518316521 is 1256138157.

It is a cyclic number.

It is not a de Polignac number, because 7518316521 - 2³ = 7518316513 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7518316521.

It is not an unprimeable number, because it can be changed into a prime (7518316591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184405 + ... + 221453.

It is an arithmetic number, because the mean of its divisors is an integer number (348121800).

Almost surely, 2^7518316521 is an apocalyptic number.

It is an amenable number.

7518316521 is a deficient number, since it is larger than the sum of its proper divisors (3621581079).

7518316521 is a wasteful number, since it uses less digits than its factorization.

7518316521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37265.

The product of its digits is 50400, while the sum is 39.

The square root of 7518316521 is about 86708.2263744335. The cubic root of 7518316521 is about 1959.0260085908.

The spelling of 7518316521 in words is "seven billion, five hundred eighteen million, three hundred sixteen thousand, five hundred twenty-one".