15516131228 has 12 divisors (see below), whose sum is σ = 29241939720. Its totient is φ = 7161291312.

The previous prime is 15516131219. The next prime is 15516131231. The reversal of 15516131228 is 82213161551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149193518 + ... + 149193621.

It is an arithmetic number, because the mean of its divisors is an integer number (2436828310).

Almost surely, 2^15516131228 is an apocalyptic number.

It is an amenable number.

15516131228 is a deficient number, since it is larger than the sum of its proper divisors (13725808492).

15516131228 is a wasteful number, since it uses less digits than its factorization.

15516131228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298387156 (or 298387154 counting only the distinct ones).

The product of its digits is 14400, while the sum is 35.

Adding to 15516131228 its reverse (82213161551), we get a palindrome (97729292779).

The spelling of 15516131228 in words is "fifteen billion, five hundred sixteen million, one hundred thirty-one thousand, two hundred twenty-eight".