15531242216 has 32 divisors (see below), whose sum is σ = 33287034240. Its totient is φ = 6655086528.

The previous prime is 15531242201. The next prime is 15531242273. The reversal of 15531242216 is 61224213551.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351725 + ... + 393411.

It is an arithmetic number, because the mean of its divisors is an integer number (1040219820).

Almost surely, 2^15531242216 is an apocalyptic number.

It is an amenable number.

15531242216 is an abundant number, since it is smaller than the sum of its proper divisors (17755792024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15531242216 is a wasteful number, since it uses less digits than its factorization.

15531242216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48353 (or 48349 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

Adding to 15531242216 its reverse (61224213551), we get a palindrome (76755455767).

The spelling of 15531242216 in words is "fifteen billion, five hundred thirty-one million, two hundred forty-two thousand, two hundred sixteen".