5518121523 has 8 divisors (see below), whose sum is σ = 7367731200. Its totient is φ = 3673629768.

The previous prime is 5518121513. The next prime is 5518121561. The reversal of 5518121523 is 3251218155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5518121523 - 2⁸ = 5518121267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5518121513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1276963 + ... + 1281276.

It is an arithmetic number, because the mean of its divisors is an integer number (920966400).

Almost surely, 2^5518121523 is an apocalyptic number.

5518121523 is a deficient number, since it is larger than the sum of its proper divisors (1849609677).

5518121523 is a wasteful number, since it uses less digits than its factorization.

5518121523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558961.

The product of its digits is 12000, while the sum is 33.

The square root of 5518121523 is about 74284.0596830841. The cubic root of 5518121523 is about 1767.1106874959.

Adding to 5518121523 its reverse (3251218155), we get a palindrome (8769339678).

The spelling of 5518121523 in words is "five billion, five hundred eighteen million, one hundred twenty-one thousand, five hundred twenty-three".